Failure in call to Pay()

responseEnvelope.timestamp = 2019-05-25T22:26:53.591-07:00
responseEnvelope.ack = Failure
responseEnvelope.correlationId = 27a1c226553e4 = 52656287
error(0).errorId = 550001
error(0).domain = PLATFORM
error(0).subdomain = Application
error(0).severity = Error
error(0).category = Application
error(0).message = User is not allowed to perform this action

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Error Log ID#: 5747 (If you need to contact us, please give us this Log ID# to assist with troubleshooting.)