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Message-Level Validation {#um-intro-mlv2}
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Message-level validation (MLV) is a script-based field-level validation against `Cybersource` specifications.  
Your PTP uses amount-based test triggers to send transactions into a test environment and the Visa Certification Management System for decryption. The test results are XML or RESTful output, `Business Center` test transactions, and log prints.  
`Cybersource` validates the results with these activities:

* Cross edit checks

* Data element validation

* Interchange compliance

* Data mapping validation  
  RELATED TO THIS PAGE

* [Transit Test Cases](/content/cybsdeveloper2021/amer/en/docs/cybs/en-us/urban-mobility/developer/ctv/rest/mass-transit/um-test-cases)