Tutorial

Follow the steps in this tutorial to integrate a web application with the Google Pay API, and to configure it to accept payment cards.

Step 1: Define your Google Pay API version

Declare the version of the Google Pay API that your site uses. The major and minor versions are required in the fields of each passed object, and are included in the response.

The following code sample shows declared API versions:

const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

Step 2: Request a payment token for your payment provider

Google encrypts information about a payer's selected card for secure processing by a payment provider.

const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

Replace example and exampleGatewayMerchantId with the appropriate values for your payment provider. Use the following table to find the specific gateway and gatewayMerchantId values for your payment provider:

Gateway Parameters and documents
ABA PayWay
  "gateway": "ababank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

accept.blue
  "gateway": "acceptblue"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ACI
  "gateway": "aciworldwide"
  "gatewayMerchantId": "YOUR_ENTITY_ID"

Developer docs

ACpay
  "gateway": "acpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Acquired.com
  "gateway": "acquired"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Adyen
  "gateway": "adyen"
  "gatewayMerchantId": "YOUR_MERCHANT_ACCOUNT_NAME"

Developer docs

Airba Pay
  "gateway": "airbapay""
  "gatewayMerchantId": "YOUR_MERCHANT_ACCOUNT_NAME"

Developer docs

Airvend
  "gateway": "airvend"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Airwallex
  "gateway": "airwallex"
  "gatewayMerchantId": "YOUR_MERCHANT_ACCOUNT_NAME"

Developer docs

Akurateco
  "gateway": "akuratecolab"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Alfa-Bank
  "gateway": "alfabank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Algoritma
  "gateway": "algoritma"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Allinpay
  "gateway": "allinpayintl"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

AllPayments
  "gateway": "allpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

alticepay
  "gateway": "alticepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Anedot
  "gateway": "anedot"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ApcoPay
  "gateway": "apcopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

APPEX
  "gateway": "epos"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

AsiaBill
  "gateway": "asiabill"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Assist
  "gateway": "assist"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Assist Belarus
  "gateway": "belassist"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Assist Kazakhstan
  "gateway": "assistkz"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Aurus
  "gateway": "auruspay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Axerve
  "gateway": "gestpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Bank 131
  "gateway": "bank131"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Bank Vostok
  "gateway": "bankvostok"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Barclaycard
  "gateway": "barclayssmartpayadvance"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Barion
  "gateway": "barion"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

BCC.KZ
  "gateway": "bccpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

bePaid
  "gateway": "ecomcharge"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Bereke Bank
  "gateway": "berekepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Billing Systems
  "gateway": "billingsystems"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Bizzon
  "gateway": "bizzon"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Blocks
  "gateway": "blocks"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Bluefin
  "gateway": "bluefin"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Blue Media
  "gateway": "bluemedia"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

BlueSnap
  "gateway": "bluesnap"
  "gatewayMerchantId": "YOUR_shopToken"

Developer docs

BPC
  "gateway": "bpcpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

BR-DGE
  "gateway": "comcarde"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Braintree
  "gateway": "braintree"
  "braintree:apiVersion": "v1"
  "braintree:sdkVersion": "braintree.client.VERSION"
  "braintree:merchantId": "YOUR_BRAINTREE_MERCHANT_ID"
  "braintree:clientKey": "YOUR_BRAINTREE_TOKENIZATION_KEY"

Developer docs

Braspag
  "gateway": "cielo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

BridgerPay
  "gateway": "bridgerpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Buya
  "gateway": "buya"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CardCom
  "gateway": "cardcom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CardConnect
  "gateway": "cardconnect"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cardknox
  "gateway": "cardknox"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cardstream
  "gateway": "crst"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cashflows
  "gateway": "cashflowsgateway"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cathay United Bank
  "gateway": "cathaybk"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CCAvenue UAE
  "gateway": "ccavenueuae"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cecabank
  "gateway": "cecabank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Celerispay
  "gateway": "celerispay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CentralPay
  "gateway": "centralpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Chargehive
  "gateway": "chargehive"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CharityEngine
  "gateway": "charityengine"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Chase Merchant Services
  "gateway": "chase"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Checkout.com
  "gateway": "checkoutltd"
  "gatewayMerchantId": "YOUR_PUBLIC_KEY"

Developer docs

CityPay
  "gateway": "citypay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cloud9 Payment Gateway (C9PG)
  "gateway": "c9pg"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CloudPayments
  "gateway": "cloudpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CloudWalk
  "gateway": "cloudwalk"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Computop
  "gateway": "computop"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ConcordPay
  "gateway": "concordpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Connectum
  "gateway": "connectum"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ConnexPay
  "gateway": "connexpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Corefy
  "gateway": "paycoreio"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Corvus Pay
  "gateway": "corvuspay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Credorax
  "gateway": "credorax"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CrossPay
  "gateway": "crosspay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CSG Forte
  "gateway": "csgforte"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CTBC Bank
  "gateway": "ctbcbank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

CURO Payments
  "gateway": "curopayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Cybersource
  "gateway": "cybersource"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

danube.pay
  "gateway": "danubepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Datacap Systems, Inc.
  "gateway": "datatrans"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Datatrans
  "gateway": "datatrans"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

DECTA
  "gateway": "decta"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs

Deutsche Bank AG
  "gateway":
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs

Deutsche Bank – Merchant Solutions
  "gateway":
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

DG Financial Technology, Inc.
  "gateway": "veritrans"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Digital Finance
  "gateway": "digitalfinance"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

dLocal
  "gateway": "dlocal"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

DNA Payments
  "gateway": "dnapayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Dojo
  "gateway": "dojo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Dotpay
  "gateway": "dotpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

e-SiTef - Software Express
  "gateway": "softwareexpress"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

easycard
  "gateway": "easycard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

EasyPay
  "gateway": "easypay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

EBANX
  "gateway": "ebanx"
  "gatewayMerchantId": "YOUR_PUBLIC_INTEGRATION_KEY"

Developer docs

eCard
  "gateway": "ecard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ECOMMPAY
  "gateway": "ecommpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Ecopaynet
  "gateway": "ecopaynet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ECPay
  "gateway": "ecpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

eGHL
  "gateway": "eghl"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Elavon (Converge)
  "gateway": "convergepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Emerchantpay
  "gateway": "emerchantpay"
  "gatewayMerchantID": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

emspay
  "gateway": "emsonline"
  "gatewayMerchantID": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Encoded
  "gateway": "encoded"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

EpicPay
  "gateway": "epicpay"
  "gatewayMerchantID": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Espago
  "gateway": "espago"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

EveryPay
  "gateway": "everypay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

EVONET
  "gateway": "cardinfolink"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Evopay
  "gateway": "evopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Evo Payment Gateway
  "gateway": "evopaymentgateway"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

exactly.com
  "gateway": "exactly"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Exact Payments
  "gateway": "exactpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fat Zebra
  "gateway": "fatzebra"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fenige
  "gateway": "fenige"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fibonatix
  "gateway": "fibonatixparagon"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Financial Line
  "gateway": "finline"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Finanso UA
  "gateway": "finansoua"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

FINEXUS
  "gateway": "finexus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Finix
  "gateway": "finix"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

First American by Deluxe
  "gateway": "firstpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

FIS Biller Solutions
  "gateway": "fisglobalbsp"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fiserv
  "gateway": "fiserv"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fluid Pay
  "gateway": "fluidpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

FM Finance LTD
  "gateway": "fmfinanceltd"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ForteBank
  "gateway": "fortebank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Freedom Finance Bank
  "gateway": "axayscom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

FreedomPay
  "gateway": "freedompay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

FreedomPay.Money
  "gateway": "payboxmoney"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Freepay
  "gateway": "freepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Frontstream
  "gateway": "frontstreampayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Fung Payments
  "gateway": "fungpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GBPayments
  "gateway": "gbpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

geidea
  "gateway": "geidea"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GETTRX
  "gateway": "globalelectronictechnology"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Global One Pay
  "gateway": "globalonepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Global Payments
  "gateway": "globalpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GMO Payment Gateway
  "gateway": "gmopg"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GoDaddy Payments
  "gateway": "godaddypayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Good Idea Technologies
  "gateway": "git"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GoPay
  "gateway": "gopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

GP Webpay
  "gateway": "gpwebpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Gravity Payments
  "gateway": "gravitypayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Gr4vy
  "gateway": "gr4vy"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Halyk Bank
  "gateway": "halykbank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Helcim
  "gateway": "helcim"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

HIPS
  "gateway": "hips"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

HiTrust
  "gateway": "hitrustpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Hyp
  "gateway": "hyp"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

icard
  "gateway": "icardwallet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

iKhokha
  "gateway": "ikhokha"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

IMOJE
  "gateway": "imoje"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Impaya
  "gateway": "impayarus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

InPlat
  "gateway": "inplat"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

InstaMed
  "gateway": "instamed"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

IntellectMoney
  "gateway": "intellectmoney"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Interactive Transaction Solutions
  "gateway": "interactivets"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Interswitch Payment Gallery
  "gateway": "interswitch"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Intervale
  "gateway": "intervale"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ioka fintech
  "gateway": "ioka"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

iPay88
  "gateway": "ipay88"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

IPSI
  "gateway": "ipsi"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

iQmetrix
  "gateway": "iqmetrixpaymentservicesgateway"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

IXOPAY
  "gateway": "ixopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

JetPay
  "gateway": "jetpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

JudoPay
  "gateway": "judopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Kassa
  "gateway": "kassacom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

kassa24pay
  "gateway": "kassa24pay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Kineox
  "gateway": "kineox"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Klix by Citadele
  "gateway": "klix"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Lapsa Payments
  "gateway": "lapsapayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

LHV Pank
  "gateway": "lhvpank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Liberty
  "gateway": "liberty"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Life Pay
  "gateway": "lifepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Limepay
  "gateway": "limepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

LiqPay
  "gateway": "liqpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Littlepay
  "gateway": "littlepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

LogPay
  "gateway": "logpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Loyale
  "gateway": "loyale"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

lynck
  "gateway": "lynck"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Lyra
  "gateway": "lyra"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Magnetiq Bank
  "gateway": "magnetiq"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

maib
  "gateway": "maibecomm"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MakeCommerce (Maksekeskus)
  "gateway": "maksekeskus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Mandarin
  "gateway": "mandarin"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Market Pay
  "gateway": "marketpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Mastercard Payment Gateway Services
  "gateway": "mpgs"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MerchantE
  "gateway": "merchante"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Merchant Warrior
  "gateway": "merchantwarrior"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Minsait Payments Systems
  "gateway": "minsaitpaymentsgateway"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MITEC
  "gateway": "mitecmx"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MIXPLAT
  "gateway": "mixplat"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MOBI.Money
  "gateway": "mobimoney"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Modulbank
  "gateway": "modulbank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Molpay
  "gateway": "molpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Mondido
  "gateway": "mondido"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Monei
  "gateway": "monei"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

monek
  "gateway": "monek"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Moneris
  "gateway": "moneris"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Moneta
  "gateway": "moneta"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

Monext
  "gateway": "monext"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Money.Mail.Ru
  "gateway": "moneymailru"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MPay
  "gateway": "managepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

mstartipg
  "gateway": "mstartipg"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Multicarta
  "gateway": "mulitcarta"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MultiSafepay
  "gateway": "multisafepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Mundipagg
  "gateway": "mundipagg"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MyCheck
  "gateway": "mycheck"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MyChoice2Pay
  "gateway": "mychoice2pay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MyFatoorah
    "gateway": "myfatoorah"
    "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

MyPay
  "gateway": "mypay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

myPOS
  "gateway": "mypos"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

N&TS Group
  "gateway": "netsgroup"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

NCCC
  "gateway": "nccc"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Neon Pay
  "gateway": "neonpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Netopia
  "gateway": "netopia"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Netvalve
  "gateway": "netvalve"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Newebpay (formerly STPath, Pay2Go)
  "gateway": "newebpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Newtech
  "gateway": "newtechmobile"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Nexi
  "gateway": "nexi"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

NMI
  "gateway": "gatewayservices"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

noon payments
  "gateway": "noonpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Noqoody Pay
  "gateway": "noqoodypay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Novalnet
  "gateway": "novalnet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

NTT DATA
  "gateway": "nttdatahk"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Nuvei
  "gateway": "nuvei"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Oceanpayment
  "gateway": "oceanpayment"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Omise
  "gateway": "omise"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

One Inc
  "gateway": "oneinc"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Onelya
  "gateway": "onelya"
  "gatewayMerchantId": "YOUR_GATWAY_MERCHANT_ID"

Developer docs

Onerway
  "gateway": "ronghan"
  "gatewayMerchantId": "YOUR_GATWAY_MERCHANT_ID"

Developer docs

OneVision Limited
  "gateway": "onevision"
  "gatewayMerchantId": "YOUR_GATWAY_MERCHANT_ID"

Developer docs

OnPay
  "gateway": "onpayio"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Opayo by Elavon
  "gateway": "opayoelavon"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Oschadbank
  "gateway": "oschadbank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

pagarme
  "gateway": "pagarme"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PagBank
  "gateway": "pagbank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PagBrasil
  "gateway": "pagbrasil"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PagSeguro
  "gateway": "pagsegurointernational"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PAY2M
  "gateway": "pay2m"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payarc
  "gateway": "payarc"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pay.com
  "gateway": "paycom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PAYCOMET
  "gateway": "paycomet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paydock
  "gateway": "paydock"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayEase
  "gateway": "payeasenet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayEngine
  "gateway": "payengine"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayFabric
  "gateway": "payfabric"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayFacto
  "gateway": "payfacto"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

paygent
  "gateway": "paygent"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payhub
  "gateway": "payhub"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayLane
  "gateway": "paylane"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payler
  "gateway": "payler"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayLink®
  "gateway": "paylink"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payload
  "gateway": "payload"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymark
  "gateway": "paymark"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayMaster
  "gateway": "paymaster"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payment Fusion
  "gateway": "paymentfusion"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymentvision
  "gateway": "paymentvision"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymentwall
  "gateway": "paymentwall"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymo
  "gateway": "paymo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymob
  "gateway": "gpaymob"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paymtech
  "gateway": "paymtech"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayNearMe
  "gateway": "paynearme"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payneteasy
  "gateway": "payneteasy"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pay.nl
  "gateway": "paynl"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paynopain
  "gateway": "paynopain"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayOne
  "gateway": "payone"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayOnline
  "gateway": "payonline"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payoo
  "gateway": "payoo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayPlus
  "gateway": "payplus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payrails
  "gateway": "payrails"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payrexx
  "gateway": "payrexx"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayRiff
  "gateway": "payriff"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payrix
  "gateway": "payrix"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paysafe
  "gateway": "paysafe"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payscout
  "gateway": "payscout"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paysend Business
  "gateway": "paysend"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paysoft
  "gateway": "paysoft"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pay360
  "gateway": "pay360"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

paytech
  "gateway": "paytechsolutions"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayTech Ukraine
  "gateway": "paytech"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paythru
  "gateway": "paythru"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payture
  "gateway": "payture"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayU
  "gateway": "payu"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayU LATAM
  "gateway": "payulatam"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PAYUNi
  "gateway": "payuni"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayU Romania
  "gateway": "payuro"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PayU Russia
  "gateway": "payuru"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Payway
  "gateway": "payway"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Paywiser
  "gateway": "paywiser"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pelecard
  "gateway": "pelecard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pikassa
  "gateway": "pikassa"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PingPong
  "gateway": "pingpongx"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pin Payments
  "gateway": "pinpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Planet
  "gateway": "cccpayment"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PlanetPay
  "gateway": "itcardpaymentservice"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Plategka.com
  "gateway": "plategkacom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Platon
  "gateway": "platon"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Pomelo
  "gateway": "pomelopay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Portmone
  "gateway": "portmonecom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Primer
  "gateway": "primer"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Procard
  "gateway": "procard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

ProcessOut
  "gateway": "processout"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Przelewy24
  "gateway": "przelewy24"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PSCB
  "gateway": "pscbru"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

PXP Financial
  "gateway": "pxpfinancial"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Qenta Payment CEE
  "gateway": "qenta"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

QIWI
  "gateway": "qiwi"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Qualpay
  "gateway": "qualpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

QuickPay
  "gateway": "quickpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Qvalent
  "gateway": "qvalent"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Radial
  "gateway": "radial"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Rapyd
  "gateway": "rapyd"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

RBK.money
  "gateway": "rbkmoney"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Rebail Capital
  "gateway": "rebailcapital"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Rebilly
  "gateway": "Rebilly"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Recurly
  "gateway": "recurly"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Reddot
  "gateway": "reddotpayment"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Rede
  "gateway": "rede"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Redsys
  "gateway": "redsys"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Reepay
  "gateway": "reepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

RocketGate
  "gateway": "rocketgate"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Russian Standard Bank
  "gateway": "rsb"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Ryft
  "gateway": "ryft"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Saferpay
  "gateway": "worldlinesaferpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Safexpay
  "gateway": "safexpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Sberbank
  "gateway": "sberbank"
  "gatewayMerchantId": "YOUR_ORGANIZATION_NAME"

Developer docs

SEB Baltic
  "gateway": "sebbaltic"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Sense Bank
  "gateway": "sensebank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

SensePass
  "gateway": "sensepass"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Shift4
  "gateway": "shift4payments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Shiji Group
  "gateway": "shijipaymentsolutions"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

SH Start High
  "gateway": "shstartpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

simbasoft
  "gateway": "simbasoft"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Sipay
  "gateway": "sipay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Softbank Payment Service
  "gateway": "sbps"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Solid
  "gateway": "solid"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Sony Payment Services
  "gateway": "sonypaymentservices"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Splitit
  "gateway": "splitit"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Spreedly
  "gateway": "spreedly"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Square
  "gateway": "square"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

SredaPay
  "gateway": "sredapay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Stancer
  "gateway": "stancer"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Stripe
  "gateway": "stripe"
  "stripe:version": "2018-10-31"
  "stripe:publishableKey": "YOUR_PUBLIC_STRIPE_KEY"

Developer docs

Suntech
  "gateway": "esafe"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Surfboard Payments
  "gateway": "surfboard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Svea Bank
  "gateway": "svea"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Swedbank Baltic
  "gateway": "swedbankbaltic"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Swedbank Pay
  "gateway": "payexswedbankpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TabaPay
  "gateway": "tabapay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TapPay (Cherri Tech)
  "gateway": "tappay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TapPayments
  "gateway": "tappayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

tarlanpayments
  "gateway": "tarlanpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TAS Link
  "gateway": "taslink"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tatra banka (CardPay)
  "gateway": "tatrabanka"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

TEKO
  "gateway": "teko"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

theMAP
  "gateway": "themap"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Till Payments
  "gateway": "tillpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tinkoff
  "gateway": "tinkoff"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TPay
  "gateway": "tpaycom"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TPay.com
  "gateway": "tpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Transact Campus
  "gateway": "transactcampus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Transaction Services Network
  "gateway": "tns"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Transpayrent
  "gateway": "transpayrent"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tranzila
  "gateway": "tranzila"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tranzzo
  "gateway": "tranzzo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tribe Payments
  "gateway": "tribepayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Truevo
  "gateway": "truevo"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

TrustPay
  "gateway": "trustpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Trust Payments
  "gateway": "trustpayments"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tuna
  "gateway": "tuna"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

2can&ibox
  "gateway": "twocan"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

UAPAY
  "gateway": "uapay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

UBRR
  "gateway": "ubrrpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Ukrcardpay
  "gateway": "ukrcardpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

UkrGasBank Pay
  "gateway": "ukrgasbankpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Unibank OJSC
  "gateway": "unibankcheckout"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

unitedfinancialcorporation
  "gateway": "unitedfinancialcorporation"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Uniteller
  "gateway": "uniteller"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Unitpay
  "gateway": "unitpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Unlimint
  "gateway": "unlimint"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Unzer
  "gateway": "unzer"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Unzer Austria
  "gateway": "unzeraustria"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

UPC
  "gateway": "upc"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Upgate
  "gateway": "upgate"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

USAePay
  "gateway": "usaepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

UseePay
  "gateway": "useepay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Valitor
  "gateway": "valitor"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Vantiv
  "gateway": "vantiv"
  "vantiv:merchantPayPageId": "YOUR_PAY_PAGE_ID"
  "vantiv:merchantOrderId": "YOUR_ORDER_ID"
  "vantiv:merchantTransactionId": "YOUR_TRANSACTION_ID"
  "vantiv:merchantReportGroup": "*web"

Developer docs

Verestro
  "gateway": "verestro"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Very Good Security
  "gateway": "verygoodsecurity"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Vindicia
  "gateway": "vindicia"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Viva Wallet
  "gateway": "vivawallet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

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VTEX
  "gateway": "vtex"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

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Walletdoc
  "gateway": "walletdoc"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Walletto
  "gateway": "walletto"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WayForPay
  "gateway": "wayforpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WEAT
  "gateway": "weatpay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WhenThen
  "gateway": "whenthen"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Windcave
  "gateway": "windcave"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Wirebank
  "gateway": "wirebank"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Wirecard
  "gateway": "wirecard"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WOOPPAY
  "gateway": "wooppay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WooshPay
  "gateway": "swooshtransfer"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldline (GlobalCollect)
  "gateway": "globalcollect"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldline - Ingenico (WL Online Checkout)
  "gateway": "worldlineingenicoogone"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldline Nordics (Worldline Online Checkout)
  "gateway": "worldlineonlinecheckout"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldline Sips
  "gateway": "wlsips"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldnet
  "gateway": "worldnet"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Worldpay
  "gateway": "worldpay"
  "gatewayMerchantId": "YOUR_WORLDPAY_MERCHANT_ID"

Developer docs

Wpay
  "gateway": "wpayaus"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

WSPay
  "gateway": "wspay"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

XPATE
  "gateway": "xpate"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

xpay
  "gateway": "xpaycomua"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

YIĞIM Payment System
  "gateway": "yigim"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

No developer docs available

ЮKassa (YooKassa)
  "gateway": "yoomoney"
  "gatewayMerchantId": "YOUR_SHOP_ID"

Developer docs

Z-credit
  "gateway": "zcredit"
  "gatewayMerchantId": "YOUR_SHOP_ID"

Developer docs

ZEN.com
  "gateway": "zen"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Zest
  "gateway": "zestpayment"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Zuora
  "gateway": "zuora"
  "gatewayMerchantId": "YOUR_GATEWAY_MERCHANT_ID"

Developer docs

Tip: example is a valid gateway name in the test environment. If you want to try out the API, you can leave the code sample above as-is. When you use the example gateway, your site doesn't receive card data capable of a transaction, but the user flow looks the same.

The PAYMENT_GATEWAY tokenization type is the most common merchant implementation of the card payment method in the Google Pay API. If your payment provider isn't supported, you might be able to accept Google Pay by a DIRECT integration. For more information, see the Direct tokenization documentation.

Step 3: Define supported payment card networks

Define the card networks accepted by your site. See the following code sample:

const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

The Google Pay API might return cards on file on Google.com (PAN_ONLY) or a device token on an Android-powered device authenticated with a 3-D Secure cryptogram (CRYPTOGRAM_3DS). You can control whether both methods or just one of them can be returned.

Before you set allowedCardAuthMethods, confirm with your payment processor and acquirer on whether device tokens (CRYPTOGRAM_3DS) are supported in your region.

See the following code sample:

const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

For more information, see CardParameters in our Object reference documentation. Also, check with your gateway or processor for the card networks that are supported, and for support for Android device tokens.

Important:
  • Make sure that you also apply your existing risk checks and controls for payment transactions to Google Pay transactions. Google Pay validation and fraud checks aren't intended to replace your risk management processes.
  • If you support PAN_ONLY, ensure that you trigger 3D Secure (step-up authentication) for Google Pay PAN PAN_ONLY transactions in the same way that you trigger 3D Secure for normal card transactions.

Step 4: Describe your allowed payment methods

To describe your allowed payment methods, complete the following steps:

  1. Combine your supported authentication methods and supported card networks in order to describe your site's support for the CARD payment method. See the following code sample:
    const baseCardPaymentMethod = {
      type: 'CARD',
      parameters: {
        allowedAuthMethods: allowedCardAuthMethods,
        allowedCardNetworks: allowedCardNetworks
      }
    };
  2. Extend the base card payment method object to describe information you expect to be returned to your application. Include a description of the tokenized payment data. See the following code sample:
    const cardPaymentMethod = Object.assign(
      {tokenizationSpecification: tokenizationSpecification},
      baseCardPaymentMethod
    );
  3. For more information about supported parameters, see CardParameters.

    Google Pay currently only supports the CARD payment method type.

Step 5: Load the Google Pay API JavaScript library

To load the Google Pay API JavaScript library, complete the following steps:

  1. Include Google's hosted JavaScript on your page. See the following code sample:
    <script
      async
      src="https://pay.google.com/gp/p/js/pay.js"
      onload="console.log('TODO: add onload function')">
    </script>
  2. After the Google Pay API JavaScript library loads, initialize a PaymentsClient object. Initial development uses a TEST environment, which returns dummy payment methods that are suitable to reference the structure of a payment response. In this environment, a selected payment method isn't capable of a transaction. See the following code sample.
    Note: We recommend that you only initialize paymentsClient once. Use the same instance when you invoke all of the other APIs, like CreateButton, IsReadyToPay, PrefetchPaymentData, and LoadPaymentData.
    const paymentsClient =
        new google.payments.api.PaymentsClient({environment: 'TEST'});

    For more information about the requirements for a PRODUCTION environment that returns chargeable payment methods, see the Integration checklist.

Step 6: Determine readiness to pay with the Google Pay API

To determine readiness to pay with the Google Pay API, complete the following steps:

  1. Add your allowed payment methods to your base request object. See the following code sample:
    const isReadyToPayRequest = Object.assign({}, baseRequest);
    isReadyToPayRequest.allowedPaymentMethods = [baseCardPaymentMethod];
  2. Call isReadyToPay() to determine if the Google Pay API is supported by the current device and browser for your specified payment methods. See the following code sample:
    paymentsClient.isReadyToPay(isReadyToPayRequest)
        .then(function(response) {
          if (response.result) {
            // add a Google Pay payment button
          }
        })
        .catch(function(err) {
          // show error in developer console for debugging
          console.error(err);
        });

Step 7: Add a Google Pay payment button

Add a Google Pay payment button to your page to encourage shoppers to check out with payment methods that are supported by the Google Pay API and your site. For more information about available button types, colors, and display requirements, see the Brand guidelines.

See the following payment button code sample:

const button =
    paymentsClient.createButton({onClick: () => console.log('TODO: click handler'),
    allowedPaymentMethods: []}); // same payment methods as for the loadPaymentData() API call
document.getElementById('container').appendChild(button);

Step 8: Create a PaymentDataRequest object

To create a PaymentDataRequest object, complete the following steps:

  1. Build a JavaScript object that describes your site's support for the Google Pay API. For a full list of supported properties, see PaymentDataRequest. See the following code sample:
    const paymentDataRequest = Object.assign({}, baseRequest);
  2. Add the payment methods supported by your app, such as any configuration of additional data that's expected in the response. See the following code sample:
    paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  3. Define a total price and currency for a shopper to authorize. See the following code sample:
    Important: Merchants that process transactions in the European Economic Area (EEA) or any other countries that are subject to Strong Customer Authentication (SCA) must include the countryCode, totalPrice, and merchantName parameters to meet SCA requirements.
    paymentDataRequest.transactionInfo = {
      totalPriceStatus: 'FINAL',
      totalPrice: '123.45',
      currencyCode: 'USD',
      countryCode: 'US'
    };
  4. Provide a user-visible merchant name, and use our TEST merchantId value when in TEST. For more details, and for information on when to replace the TEST merchantId value, see MerchantInfo. See the following code sample of a user-visible merchant name:
    paymentDataRequest.merchantInfo = {
      merchantName: 'Example Merchant'
      merchantId: '12345678901234567890'
    };
    Note: Our TEST merchantId value is numeric. Your specific merchantId value can be numeric or alphanumeric. Review MerchantInfo for more details on how to obtain your specific merchantId.

Step 9: Register an event handler for user gestures

To register an event handler for user gestures, complete the following steps:

  1. Register a click event handler for the purchase button. The event handler calls loadPaymentData() immediately after it interacts with the Google Pay, payment button.
  2. After a Google user grants permission for your site to receive information about the user's selected form of payment and optional contact data, handle the response from the Google Pay API.
  3. Extract the payment token from the paymentData response. If you implement a gateway integration, pass this token to your gateway without any modifications.
    Note: In a TEST environment, a payment response includes summary data about the selected payment method that's suitable for display on a confirmation page. The payment response doesn't include a payment method that's capable of a transaction.
    paymentsClient.loadPaymentData(paymentDataRequest).then(function(paymentData){
      // if using gateway tokenization, pass this token without modification
      paymentToken = paymentData.paymentMethodData.tokenizationData.token;
    }).catch(function(err){
      // show error in developer console for debugging
      console.error(err);
    });

Step 10 (optional): Set up Authorize Payments

Authorize Payments is used to start the payment process and acknowledge a payment's authorization status.

To set up Authorize Payments, take the following steps:

  1. Register an onPaymentAuthorized() callback in PaymentOptions.
  2. Call the loadPaymentData() function with the PAYMENT_AUTHORIZATION callback intent.
  3. Implement onPaymentAuthorized().

Register onPaymentAuthorized callbacks

The following code sample shows how to register onPaymentAuthorized callbacks:

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentAuthorized: onPaymentAuthorized
  }
}

Load payment data with callback intents

The following code sample shows how to initialize the payment sheet with Authorize Payments:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantName: 'Example Merchant'
  merchantId: '12345678901234567890',
};

paymentDataRequest.callbackIntents = ["PAYMENT_AUTHORIZATION"];

Handle onPaymentAuthorized callbacks

The onPaymentAuthorized() callback is invoked with a PaymentData object by Google after a payer approves payment through a user gesture, such as if they click Pay.

The callback returns a Promise<PaymentAuthorizationResult> value. The PaymentAuthorizationResult object has a SUCCESS or ERROR transaction state status. Upon success, the payment sheet is closed successfully. If you encounter an error, the payment sheet renders the error details returned after the payment is processed. The user can change the payment sheet’s payment data and authorize the payment again. See the following code sample:

function onPaymentAuthorized(paymentData) {
  return new Promise(function(resolve, reject){
    // handle the response
    processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
      resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
    });
  });
}

Step 11 (optional for shipping-enabled): Set up Dynamic Price Updates

Dynamic Price Updates allows a merchant to dynamically update shipping options and transaction information based on a chosen shipping address. Additionally, you can dynamically update transaction information based on a chosen shipping option.

To set up Dynamic Price Updates, take the following steps:

  1. Register both the onPaymentAuthorized and onPaymentDataChanged callbacks in PaymentOptions.
  2. Call the loadPaymentData() function with callback intents. For details, see the corresponding example.
  3. Implement onPaymentAuthorized and onPaymentDataChanged.

Register PaymentData callback

The following code sample shows that Dynamic Price Updates requires callback functions to be registered in the PaymentsClient paymentOptions object.

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentAuthorized: onPaymentAuthorized,
    onPaymentDataChanged: onPaymentDataChanged
  }
}

Load payment data with callback intents

The following code sample shows how a payment sheet must be initialized with a required shipping address and shipping options configuration:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantId: '12345678901234567890',
  merchantName: 'Example Merchant'
};

paymentDataRequest.callbackIntents = ["SHIPPING_ADDRESS",  "SHIPPING_OPTION", "PAYMENT_AUTHORIZATION"];


paymentDataRequest.shippingAddressRequired = true;
paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();
paymentDataRequest.shippingOptionRequired = true;

Handle onPaymentDataChanged callback

The onPaymentDataChanged callback is invoked with an IntermediatePaymentData object, which includes the shipping address and shipping option selected in the payment sheet.

The callback returns a Promise<PaymentDataRequestUpdate>. The PaymentDataRequestUpdate object has new transaction information, shipping options, and a payment data error. This data updates the payment sheet.

Handle any exception cases, such as an unserviceable shipping address or invalid shipping option, directly in the payment sheet. Set up a PaymentDataError object to highlight the reason for the error with an error message to the user. Be sure to include the related intent in the message. For details on how to set up the object and message, see the following code sample:

function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let shippingAddress = intermediatePaymentData.shippingAddress;
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};

    if (intermediatePaymentData.callbackTrigger == "INITIALIZE" || intermediatePaymentData.callbackTrigger == "SHIPPING_ADDRESS") {
      if(shippingAddress.administrativeArea == "NJ")  {
        paymentDataRequestUpdate.error = getGoogleUnserviceableAddressError();
      }
      else {
        paymentDataRequestUpdate.newShippingOptionParameters = getGoogleDefaultShippingOptions();
        let selectedShippingOptionId = paymentDataRequestUpdate.newShippingOptionParameters.defaultSelectedOptionId;
        paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(selectedShippingOptionId);
      }
    }
    else if (intermediatePaymentData.callbackTrigger == "SHIPPING_OPTION") {
      paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(shippingOptionData.id);
    }

    resolve(paymentDataRequestUpdate);
  });
}

Step 12 (optional for promo codes): Set up Promo Codes

Promo Codes allow a merchant to dynamically update shipping options and transaction information based on a provided promotional code.

To set up Promo Codes, take the following steps:

  1. Register the onPaymentDataChanged callbacks in PaymentOptions.
  2. Call the loadPaymentData() function with callback intents. For details, see the corresponding example.
  3. Implement the onPaymentDataChanged callback function.

Register Offer callback

The following code sample shows that Promo Codes require callback functions to be registered in the PaymentsClient paymentOptions object.

{
  environment: "TEST",
  merchantInfo: {
    merchantName: "Example Merchant",
    merchantId: "12345678901234567890"
  },
  paymentDataCallbacks: {
    onPaymentDataChanged: onPaymentDataChanged
  }
}

Load payment data with callback intents

The following code sample shows how a payment sheet must be initialized with an OFFER callback intent:

const paymentDataRequest = Object.assign({}, baseRequest);
paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
paymentDataRequest.merchantInfo = {
  merchantId: '12345678901234567890',
  merchantName: 'Example Merchant'
};

paymentDataRequest.callbackIntents = ["OFFER"];

Handle onPaymentDataChanged callback

The onPaymentDataChanged callback is invoked with an IntermediatePaymentData object, which includes the shipping address and shipping option selected in the payment sheet.

The callback must return a Promise<PaymentDataRequestUpdate>. The PaymentDataRequestUpdate object has new transaction information, shipping options, offer data, and a payment data error. This data updates the payment sheet.

Handle any exception cases, such as an invalid promo code, directly in the payment sheet. Set up a PaymentDataError object to highlight the reason for the error with an error message to the user. Be sure to include the related intent in the message. For details on how to set up the object and message, see the following code sample, which references an object (validPromoCodes) containing the promo code values:

function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let redemptionCodes = [];
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};
    paymentDataRequestUpdate.newTransactionInfo = getGoogleTransactionInfo();

    // ensure that promo codes set is unique
    if(typeof intermediatePaymentData.offerData != 'undefined') {
      // convert to set then back to array
      redemptionCodes = Array.from(
        new Set(intermediatePaymentData.offerData.redemptionCodes)
      );
    }

    // OPTIONAL: ensure that the newest promo code is the only one applied
    // redemptionCodes = new Array(redemptionCodes[redemptionCodes.length -1]);

    // validate promo codes and add descriptions to payment sheet
    if (intermediatePaymentData.callbackTrigger === 'OFFER') {
      paymentDataRequestUpdate.newOfferInfo = {};
      paymentDataRequestUpdate.newOfferInfo.offers = [];
      for (redemptionCode of redemptionCodes) {
        if (validPromoCodes[redemptionCode]) {
          paymentDataRequestUpdate = validPromoCodes[redemptionCode].function(
            validPromoCodes[redemptionCode],
            paymentDataRequestUpdate
          );
        } else {
          paymentDataRequestUpdate.error = getGoogleOfferInvalidError(redemptionCode);
        }
      }
    }

Put it all together

The example code blocks in this section show a complete end-to-end example of the Google Pay API JavaScript library tutorial, Authorize Payments, Dynamic Price Updates, and Promo Codes.

Tutorial

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };
  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({environment: 'TEST'});
  }
  return paymentsClient;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
    countryCode: 'US',
    currencyCode: 'USD',
    totalPriceStatus: 'FINAL',
    // set to cart total
    totalPrice: '1.00'
  };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}

/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest)
      .then(function(paymentData) {
        // handle the response
        processPayment(paymentData);
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}
/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
  // show returned data in developer console for debugging
    console.log(paymentData);
  // @todo pass payment token to your gateway to process payment
  // @note DO NOT save the payment credentials for future transactions,
  // unless they're used for merchant-initiated transactions with user
  // consent in place.
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Authorize Payments

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "INTERAC", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ["PAYMENT_AUTHORIZATION"];

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
    	environment: 'TEST',
      paymentDataCallbacks: {
      	onPaymentAuthorized: onPaymentAuthorized
      }
    });
  }
  return paymentsClient;
}

/**
 * Handles authorize payments callback intents.
 *
 * @param {object} paymentData response from Google Pay API after a payer approves payment through user gesture.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentAuthorizationResult}
 * @returns Promise<{object}> Promise of PaymentAuthorizationResult object to acknowledge the payment authorization status.
 */
function onPaymentAuthorized(paymentData) {
	return new Promise(function(resolve, reject){
    // handle the response
    processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
      resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
  	});
  });
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: "Subtotal",
          type: "SUBTOTAL",
          price: "11.00",
        },
      {
          label: "Tax",
          type: "TAX",
          price: "1.00",
        }
    ],
    countryCode: 'US',
    currencyCode: "USD",
    totalPriceStatus: "FINAL",
    totalPrice: "12.00",
    totalPriceLabel: "Total"
  };
}

/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest);
}

/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
	return new Promise(function(resolve, reject) {
  	setTimeout(function() {
  		// @todo pass payment token to your gateway to process payment
  		paymentToken = paymentData.paymentMethodData.tokenizationData.token;

    	resolve({});
    }, 3000);
  });
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Dynamic Price Updates

<div id="container"></div>

<script>
/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ["AMEX", "DISCOVER", "JCB", "MASTERCARD", "VISA"];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'example',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ["SHIPPING_ADDRESS",  "SHIPPING_OPTION", "PAYMENT_AUTHORIZATION"];
  paymentDataRequest.shippingAddressRequired = true;
  paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();
  paymentDataRequest.shippingOptionRequired = true;

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
      environment: "TEST",
      merchantInfo: {
        merchantName: "Example Merchant",
        merchantId: "01234567890123456789"
      },
      paymentDataCallbacks: {
      	onPaymentAuthorized: onPaymentAuthorized,
        onPaymentDataChanged: onPaymentDataChanged
      }
    });
  }
  return paymentsClient;
}


function onPaymentAuthorized(paymentData) {
	return new Promise(function(resolve, reject){

  // handle the response
  processPayment(paymentData)
    .then(function() {
      resolve({transactionState: 'SUCCESS'});
    })
    .catch(function() {
    	resolve({
        transactionState: 'ERROR',
        error: {
          intent: 'PAYMENT_AUTHORIZATION',
          message: 'Insufficient funds',
          reason: 'PAYMENT_DATA_INVALID'
        }
      });
    });

  });
}

/**
 * Handles dynamic buy flow shipping address and shipping options callback intents.
 *
 * @param {object} itermediatePaymentData response from Google Pay API a shipping address or shipping option is selected in the payment sheet.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#IntermediatePaymentData|IntermediatePaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @returns Promise<{object}> Promise of PaymentDataRequestUpdate object to update the payment sheet.
 */
function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

   	let shippingAddress = intermediatePaymentData.shippingAddress;
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};

    if (intermediatePaymentData.callbackTrigger == "INITIALIZE" || intermediatePaymentData.callbackTrigger == "SHIPPING_ADDRESS") {
      if(shippingAddress.administrativeArea == "NJ")  {
        paymentDataRequestUpdate.error = getGoogleUnserviceableAddressError();
      }
      else {
        paymentDataRequestUpdate.newShippingOptionParameters = getGoogleDefaultShippingOptions();
        let selectedShippingOptionId = paymentDataRequestUpdate.newShippingOptionParameters.defaultSelectedOptionId;
        paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(selectedShippingOptionId);
      }
    }
    else if (intermediatePaymentData.callbackTrigger == "SHIPPING_OPTION") {
      paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(shippingOptionData.id);
    }

    resolve(paymentDataRequestUpdate);
  });
}

/**
 * Helper function to create a new TransactionInfo object.

 * @param string shippingOptionId respresenting the selected shipping option in the payment sheet.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function calculateNewTransactionInfo(shippingOptionId) {
        let newTransactionInfo = getGoogleTransactionInfo();

  let shippingCost = getShippingCosts()[shippingOptionId];
  newTransactionInfo.displayItems.push({
    type: "LINE_ITEM",
    label: "Shipping cost",
    price: shippingCost,
    status: "FINAL"
  });

  let totalPrice = 0.00;
  newTransactionInfo.displayItems.forEach(displayItem => totalPrice += parseFloat(displayItem.price));
  newTransactionInfo.totalPrice = totalPrice.toString();

  return newTransactionInfo;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: "Subtotal",
          type: "SUBTOTAL",
          price: "11.00",
        },
      {
          label: "Tax",
          type: "TAX",
          price: "1.00",
        }
    ],
    countryCode: 'US',
    currencyCode: "USD",
    totalPriceStatus: "FINAL",
    totalPrice: "12.00",
    totalPriceLabel: "Total"
  };
}

/**
 * Provide a key value store for shippping options.
 */
function getShippingCosts() {
        return {
    "shipping-001": "0.00",
    "shipping-002": "1.99",
    "shipping-003": "10.00"
  }
}

/**
 * Provide Google Pay API with shipping address parameters when using dynamic buy flow.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingAddressParameters|ShippingAddressParameters}
 * @returns {object} shipping address details, suitable for use as shippingAddressParameters property of PaymentDataRequest
 */
function getGoogleShippingAddressParameters() {
        return  {
        allowedCountryCodes: ['US'],
    phoneNumberRequired: true
  };
}

/**
 * Provide Google Pay API with shipping options and a default selected shipping option.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingOptionParameters|ShippingOptionParameters}
 * @returns {object} shipping option parameters, suitable for use as shippingOptionParameters property of PaymentDataRequest
 */
function getGoogleDefaultShippingOptions() {
        return {
      defaultSelectedOptionId: "shipping-001",
      shippingOptions: [
        {
          "id": "shipping-001",
          "label": "Free: Standard shipping",
          "description": "Free Shipping delivered in 5 business days."
        },
        {
          "id": "shipping-002",
          "label": "$1.99: Standard shipping",
          "description": "Standard shipping delivered in 3 business days."
        },
        {
          "id": "shipping-003",
          "label": "$10: Express shipping",
          "description": "Express shipping delivered in 1 business day."
        },
      ]
  };
}

/**
 * Provide Google Pay API with a payment data error.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataError|PaymentDataError}
 * @returns {object} payment data error, suitable for use as error property of PaymentDataRequestUpdate
 */
function getGoogleUnserviceableAddressError() {
        return {
    reason: "SHIPPING_ADDRESS_UNSERVICEABLE",
    message: "Cannot ship to the selected address",
    intent: "SHIPPING_ADDRESS"
        };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}


/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest);
}

/**
 * Process payment data returned by the Google Pay API
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
	return new Promise(function(resolve, reject) {
  	setTimeout(function() {
    	// show returned data in developer console for debugging
   	 console.log(paymentData);
  		// @todo pass payment token to your gateway to process payment
  		paymentToken = paymentData.paymentMethodData.tokenizationData.token;

    	resolve({});
    }, 3000);
  });
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>

Offers

<div id="container"></div>

<script>
/**
 * Please note: The Promo Code callback is extremely flexible. This example
 * implementation is only one of many ways to interface with it.
 *
 * In production, your promo codes and payment logic should be securely
 * processed on your server, not client-side as in this example. Use AJAX to
 * pass this information to the payment sheet.
 */

/**
 * Define the version of the Google Pay API referenced when creating your
 * configuration
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|apiVersion in PaymentDataRequest}
 */
const baseRequest = {
  apiVersion: 2,
  apiVersionMinor: 0
};

/**
 * Define valid promo code strings
 *
 * This object paradigm is not necessary to implement Promo Codes, but provides
 * an example of how to implement promo code behavior in a modular way.
 *
 * In production, your promo codes should be securely processed on your server,
 * not client-side as in this example.
 *
 * code: the way the promo code itself is displayed in the payment sheet
 * description: the description provided to the user on the payment sheet
 * function: the function used to calculate the price change
 * value: the value passed into the above function. This value should be
 * negative for a discount.
 */

const validPromoCodes = {
  SOMEPROMOCODE: {
    code: 'SOMEPROMOCODE',
    description: '20% off all products!',
    function: percentageDiscount,
    value: -20 // value should be negative for a discount
  },
  ANOTHERPROMOCODE: {
    code: 'ANOTHERPROMOCODE',
    description: '$5 dollars off!',
    function: staticDiscount,
    value: -5.00 // value should be negative for a discount
  }
}

/**
 * Card networks supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm card networks supported by your site and gateway
 */
const allowedCardNetworks = ['AMEX', 'DISCOVER', 'JCB', 'MASTERCARD', 'VISA'];

/**
 * Card authentication methods supported by your site and your gateway
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 * @todo confirm your processor supports Android device tokens for your
 * supported card networks
 */
const allowedCardAuthMethods = ['PAN_ONLY', 'CRYPTOGRAM_3DS'];

/**
 * Identify your gateway and your site's gateway merchant identifier
 *
 * The Google Pay API response will return an encrypted payment method capable
 * of being charged by a supported gateway after payer authorization
 *
 * @todo check with your gateway on the parameters to pass
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#gateway|PaymentMethodTokenizationSpecification}
 */
const tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    gateway: 'example',
    gatewayMerchantId: 'exampleGatewayMerchantId'
  }
};

/**
 * Describe your site's support for the CARD payment method and its required
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const baseCardPaymentMethod = {
  type: 'CARD',
  parameters: {
    allowedAuthMethods: allowedCardAuthMethods,
    allowedCardNetworks: allowedCardNetworks
  }
};

/**
 * Describe your site's support for the CARD payment method including optional
 * fields
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#CardParameters|CardParameters}
 */
const cardPaymentMethod = Object.assign(
  {},
  baseCardPaymentMethod,
  {
    tokenizationSpecification: tokenizationSpecification
  }
);

/**
 * An initialized google.payments.api.PaymentsClient object or null if not yet set
 *
 * @see {@link getGooglePaymentsClient}
 */
let paymentsClient = null;

/**
 * Configure your site's support for payment methods supported by the Google Pay
 * API.
 *
 * Each member of allowedPaymentMethods should contain only the required fields,
 * allowing reuse of this base request when determining a viewer's ability
 * to pay and later requesting a supported payment method
 *
 * @returns {object} Google Pay API version, payment methods supported by the site
 */
function getGoogleIsReadyToPayRequest() {
  return Object.assign(
      {},
      baseRequest,
      {
        allowedPaymentMethods: [baseCardPaymentMethod]
      }
  );
}

/**
 * Configure support for the Google Pay API
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#PaymentDataRequest|PaymentDataRequest}
 * @returns {object} PaymentDataRequest fields
 */
function getGooglePaymentDataRequest() {
  const paymentDataRequest = Object.assign({}, baseRequest);
  paymentDataRequest.allowedPaymentMethods = [cardPaymentMethod];
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();
  paymentDataRequest.merchantInfo = {
    // @todo a merchant ID is available for a production environment after approval by Google
    // See {@link https://developers.google.com/pay/api/web/guides/test-and-deploy/integration-checklist|Integration checklist}
    // merchantId: '12345678901234567890',
    merchantName: 'Example Merchant'
  };

  paymentDataRequest.callbackIntents = ['OFFER'];
  paymentDataRequest.shippingAddressRequired = false;
  paymentDataRequest.shippingAddressParameters = getGoogleShippingAddressParameters();

  return paymentDataRequest;
}

/**
 * Return an active PaymentsClient or initialize
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#PaymentsClient|PaymentsClient constructor}
 * @returns {google.payments.api.PaymentsClient} Google Pay API client
 */
function getGooglePaymentsClient() {
  if ( paymentsClient === null ) {
    paymentsClient = new google.payments.api.PaymentsClient({
      environment: 'TEST',
      merchantInfo: {
        merchantName: 'Example Merchant',
        merchantId: '01234567890123456789'
      },
      paymentDataCallbacks: {
        onPaymentDataChanged: onPaymentDataChanged
      }
    });
  }
  return paymentsClient;
}

/**
 * These functions handle adding valid promo codes to the payment sheet
 * as well as adjusting the display items to match.
 *
 * To add a new promo code, create a new function per this template
 * and define it as valid in the onPaymentDataChanged function.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @param {string} redemptionCode string representing the promo code to apply
 * @param {string} description string representing the description to show
 * @param {int} discountPercentage int representing the percentage to discount.
 * Please note the discount value should be negative. Ex: -20 = 20% discount.
 * @param {object} PaymentDataRequestUpdate object representing
 * the current state of the payment data request.
 * @returns {object} PaymentDataRequestUpdate object to update the
 * payment sheet with new transaction info and offer data.
 */

function percentageDiscount(promoParameters, paymentDataRequestUpdate) {
  // set variables
  let originalTransactionInfo = getGoogleTransactionInfo();
  /* because this promo code calculates a % of original prices,
   * we need to get the original transaction info */
  let newTransactionInfo = paymentDataRequestUpdate.newTransactionInfo;
  let discount = 0;

    // update promo code and description
  paymentDataRequestUpdate.newOfferInfo.offers.push({
    redemptionCode: promoParameters['code'],
    description: promoParameters['description']
  });

  // calculate discount (from original transaction items only)
  originalTransactionInfo.displayItems.forEach(function(displayItem) {
    discount += parseFloat(displayItem.price) * promoParameters['value'] * 0.01;
  });

  // add displayItem with new discount
  newTransactionInfo.displayItems.push({
      label: promoParameters['code'],
      price: discount.toFixed(2),
      type: 'LINE_ITEM'
  });

  return paymentDataRequestUpdate;
}

function staticDiscount(promoParameters, paymentDataRequestUpdate) {
  // set variables
  let newTransactionInfo = paymentDataRequestUpdate.newTransactionInfo;

    // update promo code and description
  paymentDataRequestUpdate.newOfferInfo.offers.push({
    redemptionCode: promoParameters['code'],
    description: promoParameters['description']
  });

  // add displayItem with new discount
  newTransactionInfo.displayItems.push({
      label: promoParameters['code'],
      price: promoParameters['value'].toFixed(2),
      type: 'LINE_ITEM'
  });

  return paymentDataRequestUpdate;
}

/**
 * Handles offer callback intents.
 *
 * @param {object} itermediatePaymentData response from Google Pay API when a promo code is entered in the google pay payment sheet.
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#IntermediatePaymentData|IntermediatePaymentData object reference}
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataRequestUpdate|PaymentDataRequestUpdate}
 * @returns Promise<{object}> Promise of PaymentDataRequestUpdate object to update the payment sheet with new transaction info and offer data.
 */
function onPaymentDataChanged(intermediatePaymentData) {
  return new Promise(function(resolve, reject) {

    let redemptionCodes = new Set();
    let shippingOptionData = intermediatePaymentData.shippingOptionData;
    let paymentDataRequestUpdate = {};
    paymentDataRequestUpdate.newTransactionInfo = getGoogleTransactionInfo();

    // ensure that promo codes set is unique
    if(typeof intermediatePaymentData.offerData != 'undefined') {
      redemptionCodes = new Set(intermediatePaymentData.offerData.redemptionCodes);
    }

    // validate promo codes and add descriptions to payment sheet
    if (intermediatePaymentData.callbackTrigger === 'OFFER') {
      paymentDataRequestUpdate.newOfferInfo = {};
      paymentDataRequestUpdate.newOfferInfo.offers = [];
      for (redemptionCode of redemptionCodes) {
        if (validPromoCodes[redemptionCode]) {
          paymentDataRequestUpdate = validPromoCodes[redemptionCode].function(
            validPromoCodes[redemptionCode],
            paymentDataRequestUpdate
          );
        } else {
          paymentDataRequestUpdate.error = getGoogleOfferInvalidError(redemptionCode);
        }
      }
    }
    /**
     * Update item costs and total.
     *
     * In production, this final calculation should always be calculated
     * server-side to ensure it matches the price that the merchant sends to the
     * processor.
     */
    paymentDataRequestUpdate.newTransactionInfo = calculateNewTransactionInfo(
      paymentDataRequestUpdate.newTransactionInfo
    )

    resolve(paymentDataRequestUpdate);
  });
}

/**
 * Helper function to update the TransactionInfo object.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @param {object} transactionInfo respresenting the selected shipping option in the payment sheet.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function calculateNewTransactionInfo(newTransactionInfo) {
  // calculate the new totalPrice from display items
  let totalPrice = 0.00;
  newTransactionInfo.displayItems.forEach(
    function(displayItem) {
      totalPrice += parseFloat(displayItem.price);
    }
  );
  // Note: newTransactionInfo.totalPrice must be a string
  newTransactionInfo.totalPrice = totalPrice.toFixed(2);

  return newTransactionInfo;
}

/**
 * Initialize Google PaymentsClient after Google-hosted JavaScript has loaded
 *
 * Display a Google Pay payment button after confirmation of the viewer's
 * ability to pay.
 */
function onGooglePayLoaded() {
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.isReadyToPay(getGoogleIsReadyToPayRequest())
      .then(function(response) {
        if (response.result) {
          addGooglePayButton();
          // @todo prefetch payment data to improve performance after confirming site functionality
          // prefetchGooglePaymentData();
        }
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Add a Google Pay purchase button alongside an existing checkout button
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ButtonOptions|Button options}
 * @see {@link https://developers.google.com/pay/api/web/guides/brand-guidelines|Google Pay brand guidelines}
 */
function addGooglePayButton() {
  const paymentsClient = getGooglePaymentsClient();
  const button =
      paymentsClient.createButton({
        onClick: onGooglePaymentButtonClicked,
        allowedPaymentMethods: [baseCardPaymentMethod]
      });
  document.getElementById('container').appendChild(button);
}

/**
 * Provide Google Pay API with a payment amount, currency, and amount status
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#TransactionInfo|TransactionInfo}
 * @returns {object} transaction info, suitable for use as transactionInfo property of PaymentDataRequest
 */
function getGoogleTransactionInfo() {
  return {
        displayItems: [
        {
          label: 'Subtotal',
          type: 'SUBTOTAL',
          price: '11.00',
          status: 'FINAL'
        },
        {
          label: 'Tax',
          type: 'TAX',
          price: '1.00'
        }
    ],
    currencyCode: 'USD',
    totalPriceStatus: 'FINAL',
    totalPrice: '12.00',
    totalPriceLabel: 'Total'
  };
}

/**
 * Provide Google Pay API with shipping address parameters.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/request-objects#ShippingAddressParameters|ShippingAddressParameters}
 * @returns {object} shipping address details, suitable for use as shippingAddressParameters property of PaymentDataRequest
 */
function getGoogleShippingAddressParameters() {
        return  {
        allowedCountryCodes: ['US', 'UK', 'FR', 'CA', 'MX', 'GA'],
    phoneNumberRequired: false
  };
}

/**
 * Provide Google Pay API with an invalid offer error.
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentDataError|PaymentDataError}
 * @returns {object} payment data error, suitable for use as error property of PaymentDataRequestUpdate
 */
function getGoogleOfferInvalidError(redemptionCode) {
        return {
    reason: 'OFFER_INVALID',
    message: redemptionCode + ' is not a valid promo code.',
    intent: 'OFFER'
        };
}

/**
 * Prefetch payment data to improve performance
 *
 * @see {@link https://developers.google.com/pay/api/web/reference/client#prefetchPaymentData|prefetchPaymentData()}
 */
function prefetchGooglePaymentData() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  // transactionInfo must be set but does not affect cache
  paymentDataRequest.transactionInfo = {
    totalPriceStatus: 'NOT_CURRENTLY_KNOWN',
    currencyCode: 'USD'
  };
  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.prefetchPaymentData(paymentDataRequest);
}


/**
 * Show Google Pay payment sheet when Google Pay payment button is clicked
 */
function onGooglePaymentButtonClicked() {
  const paymentDataRequest = getGooglePaymentDataRequest();
  paymentDataRequest.transactionInfo = getGoogleTransactionInfo();

  const paymentsClient = getGooglePaymentsClient();
  paymentsClient.loadPaymentData(paymentDataRequest)
      .then(function(paymentData) {
        // handle the response
        processPayment(paymentData);
      })
      .catch(function(err) {
        // show error in developer console for debugging
        console.error(err);
      });
}

/**
 * Process payment data returned by the Google Pay API
 * In a production environment, this function should always be implemented
 * server-side.
 *
 * @param {object} paymentData response from Google Pay API after user approves payment
 * @see {@link https://developers.google.com/pay/api/web/reference/response-objects#PaymentData|PaymentData object reference}
 */
function processPayment(paymentData) {
  // show returned data in developer console for debugging
    console.log(paymentData);
  // @todo pass payment token to your gateway to process payment
  paymentToken = paymentData.paymentMethodData.tokenizationData.token;
}</script>
<script async
  src="https://pay.google.com/gp/p/js/pay.js"
  onload="onGooglePayLoaded()"></script>
Objective: Proceed to our Integration checklist to validate your integration and request production access.