Changes to Get branding for an integration

added the optional property validation to the response with the 401 status

added the optional property validation to the response with the 402 status

added the optional property validation to the response with the 403 status

added the optional property validation to the response with the 404 status

added the optional property validation to the response with the 429 status

added the optional property validation to the response with the 500 status

added the optional property validation to the response with the 503 status

added the non-success response with the status 401

added the non-success response with the status 402

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 429

added the non-success response with the status 500

added the non-success response with the status 503

for the path request parameter platformKey, the minLength was increased from 0 to 4

added the pattern [a-z]{4} to the path request parameter platformKey

for the path request parameter platformKey, the maxLength was set to 4