There are some options in the application configuration that are likely to be desired for a/b testability (e. g. donation amount options, payment types). Most probably we will be introducing more of those at a later time and should keep a/b testability in mind.

Acceptance Criteria

• Low-level application configuration can be overwritten for specific test groups during an a/b test.
• Remove handling the parameter pmt from the code (was introduced for testing additional payment method).