Payment API Manager 
This section will explain how to setup the appropriate variables to integrate with external Payment Gateways.

Paid Subscriptions > Payment API Manager will present you with the following screen, the Payment API Manager allows you to change the appropriate variables regarding payment as well as enable and disable a particular gateway.

Within debug mode further Payment API's can be added, please refer to the Developer Documentation on how to create a Payment API.
User Contributed Notes: Payment API Manager