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I can get you to the right team who can help you with the rejected merchant deposit.
To remove the payment that was cancelled, you will need to contact our Payments Support for it. That way you can reprocess the transaction again for the customer. Out Team can also help trace the returned funds for you.
To contact us, click the following link: Contact Payments Support
Please come back here anytime if you have any other questions about QuickBooks or customer payments. I'll be more than happy to help. Have a nice day!