Paynova API - Error Code 400 on Refund Request

Hi Paynova Developers,

I'm integrating the Paynova API into my application and I'm encountering an issue when attempting to process refunds. I'm receiving a 400 Bad Request error code from the API when sending a refund request.

I've carefully reviewed the API documentation and my request parameters seem to match the specifications. The transaction ID I'm using is valid and the amount requested is correct. I'm using [mention HTTP method, e.g., POST] to send the request and including all the necessary headers.

My request body looks like this: [Include a sanitized, example JSON request body - replace sensitive data with placeholders].

Could you provide any guidance on troubleshooting this error? Are there any common causes for a 400 error code during refund requests? Any assistance would be greatly appreciated. Thanks! hill climb racing