Hi there, SkyeIsESG.
I appreciate you for trying multiple cards to resolve your issue when changing your billing subscription payment.
As mentioned by my colleague above, if you received the same error 81624, this means that you enter an invalid address or the details that are not matching with the financial institution. That's why your cards cannot be accepted with the system.
Currently, there's no option to use the bank account number when changing the payment info for your subscription in QuickBooks Online International. This is only available for the US version of QBO. That being said, you can only pay for your subscription with Mastercard, Visa, Discover Card, or American Express.
For additional information, you can check this article: Update the payment information for your subscription. This also provides information on to update payment info through Google Play (Android) or App Store (iPhone or iPad).
Please refer to this article to see steps on how you can update your company information: Change company name, address, email address and privacy settings.
Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.
