Hi finance208,
Thanks for reaching out here. Welcome! Receiving a chargeback notification can be quite concerning. When using QuickBooks Online Payments, Merchant services will notify you by email, and provide instructions along with the associated case number, and how to respond. For this reason, I encourage you to review your email for any notification that has been sent.
For additional assistance, please don't hesitate to contact us at 1-855-253-1536 from Monday to Friday between the hours of 9 AM and 8 PM EST. It would be our pleasure to review this in more depth, and resolve the issue as soon as possible!
If you have any other questions, feel free to reach out again. We would be glad to help!