Root Cause

• Incomplete transaction request: Required fields (such as amount, currency, payment method details, or order ID) were not included in the API or transaction request.

• Incorrect integration or API usage: The merchant's system failed to populate mandatory fields before sending the transaction request.

• Data validation errors: The request payload contained empty or null values for critical fields required by the payment gateway.

• Gateway schema updates not reflected: Recent updates to the gateway's required parameters were not implemented in the merchant's integration.

Troubleshooting and Solutions

• Verify that all mandatory fields are provided and correctly formatted in the transaction request.

• Ensure that your integration is up to date with the latest gateway API specifications and mandatory parameter requirements.

• Implement input validation at the application level to prevent incomplete data from being submitted.

• Retry the transaction only after ensuring that no required fields are missing.

• Contact the payment gateway support team if you need clarification on required fields for specific transaction types.