Read the Mastercard case description and your processor’s instructions before compiling the response.
Check the case
- Identify the code, claim and transaction.
- Confirm the deadline and allowed response.
- Check current file and page limits.
- Save the submitted evidence and confirmation.
Requirements can differ across processors and case stages. Use the current instructions attached to the case.
Prepare the source record
Use the evidence checklist and submission workflow. For writing, see the response guide.