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If you are being denied access in your GoPayments account, start off by making sure you are entering the correct user ID. If you don't remember your login credentials, please contact payments support and an agent can help you recover the information.
This link will take you to the QuickBooks support page, where you can select your service and the proper contact channel: Contact Support
If the problem is coming from the connection to GoPayments, here's an article with steps to resolve the issue:
Fix issues with the GoPayment and QuickBooks mobile app card reader
Let us know if you need additional help!