Failure in call to Pay()

PAYPAL RESPONSE:
responseEnvelope.timestamp = 2024-02-23T06:37:30.270-08:00
responseEnvelope.ack = Failure
responseEnvelope.correlationId = 18b2f78ba7727
responseEnvelope.build = apapiserv-0.2.0_20240211222910623
error(0).errorId = 520002
error(0).domain = PLATFORM
error(0).subdomain = Application
error(0).severity = Error
error(0).category = Application
error(0).message = Internal Error

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Error Log ID#: 136 (If you need to contact us, please give us this Log ID# to assist with troubleshooting.)