TextMessageFeedItem

An extension that users can click on to send a text message to the advertiser.

Fields
business_name	string The business name to prepend to the message text. This field is required.
country_code	string Uppercase two-letter country code of the advertiser's phone number. This field is required.
phone_number	string The advertiser's phone number the message will be sent to. Required.
text	string The text to show in the ad. This field is required.
extension_text	string The message extension_text populated in the messaging app.