[Codacy] Warning issue(s) in TransactionProcessor/Controllers/MerchantController.cs

[github-actions]

Codacy detected 1 occurrence(s) of rule SonarCSharp_S1192:

• Warning at TransactionProcessor/Controllers/MerchantController.cs:63 → Define a constant instead of using this literal 'MerchantRoleName' 4 times.

See full details in Codacy Report

Unique ID: codacy-issue-1e94fc6da293265d43b0713f7898f8b9