fix: modified wrong data decoding in _checkPayloadAgainstGatewayData

[ahramy]

AXE-4792

• Modified [L-01] Wrong data decoding in _checkPayloadAgainstGatewayData
• Unit test coverage remains the same

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.51%. Comparing base (2b07e70) to head (1b8f960).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #278      +/-   ##
==========================================
+ Coverage   97.69%   98.51%   +0.82%     
==========================================
  Files          19       19              
  Lines         608      608              
  Branches      125      125              
==========================================
+ Hits          594      599       +5     
  Misses          5        5              
+ Partials        9        4       -5     

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