When the Generic Payment webhook executes, it sends a JSON request body to the payment gateway. The request body contains information about the order and about the method of payment. The gateway processes the request and returns a JSON response body that contains information about the transaction, including whether the transaction succeeded.

The set of properties in the request and response bodies, including the subobjects, vary depending on the type of transaction. For gift card gateways, there are four transaction types supported: authorize, void, refund, and balance inquiry.