Code:
- Added auth action which cross references data from the list of legacy schemes and legacy scheme details APIs. It checks whether a given PSA or PSA/PSTR combination has access to data for a scheme and uses the schemeName field, common to both responses, for matching purposes. If the schemeName doesn't match or other failures occur you will reach Page not found.
- Removed unused custom exception

Code:
- Added type annotations
- Changed comparison of String results in for comprehension
- Added logger statements
- General formatting

Code:
- Fixed scalastyle complaints
- Removed calls to list of schemes API
- Added logging for when call to getLegacySchemeDetails fails
- General refactoring
- Added test for auth actions