To create a custom integration with a gift card payment gateway, you perform the following steps:
Create the gateway extension. See Gift card extension details for information specific to this extension.
Upload the extension to the administration interface.
Enable the gateway for the sites that require it. Be sure to disable any other gift card payment gateways for those sites, such as the built-in Chase Paymentech Gift Cards gateway.
Configure the Generic Payment webhook by specifying the gateway URL and the username and password. Note that webhook settings are not site-specific. The configuration you supply applies to all sites that use this webhook.
