I need to change the payment information for several QBO accounts to use a different card detail. I keep getting error 81624. What can I do to rectify this matter?

I can help you resolve the error you're having when trying to update your payment information, @rayjackbnrjr. 

The error code you'v encountered means that we're unable to process the payment. You can also try to check the billing information that you've added matches with your bank records.

However, if you're still having an error, then let’s isolate this issue by clearing your browser’s cache. Try using a private browser when updating your payment details. If it works, proceed and clear the cache in the one that you're currently using.

Here’s how to go incognito or use a private browser:

• For Chrome, press Ctrl + Shift + N.
• For Internet Explorer or Firefox, press Ctrl + Shift + P.
• For Safari, hold down Command + Shift + N.

Here's the clearing cache and cookies to fix issues when using QuickBooks Online article for detailed instructions. 

You can also use other browsers like Chrome, Safari, Edge and the like if the steps above didn’t work.

The Community is always here if you have any other concerns. Have a great rest of the day!