The Payage_Test component is useful for performing test payments when setting up a new system, or when testing a new Gateway addon. The test component calls the Payage API in exactly the same way as any other Payage application, so examining the code of the test component is a useful first step when building your own Payage application.
The Payage trace facility, also described in the user guide, is very useful during application development and also for resolving any complex or unusual problems encountered by users. Gateway addon developers should include the appropriate code to trace relevant activity and data structures.