Creating a custom checkout process utilizing the Web Payments SDK and have successfully got Google Pay, After Pay, Cash App, and Apple Pay working. Not seeing in the Quickstart Repo or documentation anything relating to Square Pay - is it possible to offer this outside of a Square-domained site? See screenshots for the portion I’m referring to, the specific Square Pay payment method.
Square Pay currently isn’t available with the Web Payments SDK. That’s used to charge cards on file with the Square generated Checkout links. If you want to charge a customers card on file you’ll need to use the Cards API to get the customers card_id based on the customer_id. Then you’ll pass both the card_id as the source_id and the customer_id to the payment request. 
