Attaching OAuthResponseMediator to Production and Sandbox Endpoints

[ashera96]

Purpose

• Fixes OAuth 2.0 backend security with revoked tokens api-manager#767

This PR fixes the velocity template in order to facilitate the attachment of OAuthResponseMediator to Production and Sandbox endpoints.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.43%. Comparing base (432f774) to head (b9488e9).
Report is 53 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13497      +/-   ##
============================================
- Coverage     20.53%   17.43%   -3.10%     
+ Complexity     1040      872     -168     
============================================
  Files           254      255       +1     
  Lines         11495    11518      +23     
  Branches       1200     1201       +1     
============================================
- Hits           2360     2008     -352     
- Misses         9115     9493     +378     
+ Partials         20       17       -3     

Flag	Coverage Δ
integration_tests	17.43% <ø> (-3.10%)	⬇️

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