I've got some steps to fix the error so you can successfully connect your Wise business account as a payment method in QuickBooks, @deandamon12.

The error code 81624 signifies an issue with payment authorization or validation. This happens when the bank fails to authorize or validate a payment related to QuickBooks. Users might encounter this situation if they enter inaccurate details corresponding to the financial institution, such as an incorrect address.

Please note that you can pay for your subscription using Mastercard, Visa, American Express, and PayPal.

You can perform the following instructions below to get this error sorted out:

1. Please ensure all Subscription and billing fields are completed.
2. Verify your payment details.
3. Confirm your card address. Make sure it matches your QuickBooks settings.

Furthermore, make sure there are no special characters or symbols (such as @ or *) in your billing address and that your contact number is formatted correctly using the +area code.

On the other hand, you’ll want to clear your main browser’s cache if the issue persists or you can't update your billing details. After, restart your browser to completely optimize your system.

Here’s an illuminating guide to help manage your billing, payment, and subscription info in the program: Learn about your subscription.

You can tap me anytime if you need more help operating your account. I’ll be here always ready to assist you, @deandamon12.