Thanks for reaching out to the Community forum, talk2knt.
The error code 81624 means that we're unable to process the payment due to message received from your bank/card provider. You'll need to check with your bank to make sure that the billing information entered in QuickBooks matches the bank's record.
Once everything is verified, clear the cache of the browser you're using. Refer to this detailed article that has additional information about clearing cache: Clear cache and cookies to fix issues when using QuickBooks Online.
To learn more about updating billing information and subscription, take a look below articles:
Reach back out to me by commenting below if you have any questions concerning QuickBooks. I'm always here to help. Have a great day!
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