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Thanks for posting here, steinviolins.
To clarify, are you trying to update the credit card information for QuickBooks Payments? If so, you can follow these steps:
Otherwise, reach out to our Merchant Service Team by following the instructions here: Contact Payments Support.
To change the credit card or account you use to pay for QuickBooks Desktop and services like payroll, here are the steps:
I've got this article for reference: Change your QuickBooks Desktop payment method.
Please let me know if you're able to update the account information. I'm here to help you out again.