I'd be delighted to help walk you through updating your payment method in QuickBooks Online.
If you're referring to the payment method of your QuickBooks Online subscription, here's how:
On the other hand, if you encounter error while performing the update on your end, let's perform the following basic troubleshooting steps:
For additional insights, you may check out these articles:
That should do it! Fill me in if you have other questions about updating your account's payment method. I’m always here to help.