Hi, @hanser007.
Changing the account information for a direct deposit in automatic bill payment is just a few clicks. I'm happy to walk you through the whole process.
- Login to your QuickBooks Online account.
- Choose Expenses on the left pane, then click the Pay Bills Online button.
- Find the vendor's name in the Manage Vendors section.
- Hit Set up bank transfers or double click the Bank transfer.

5. Modify the vendor's bank account info and tap Next.
6. Complete the required fields and click Save.
For more details, please go through this article: Add a vendor bank account.
After changing the bank information, you'll need to initiate a small test deposit again to verify if the bank account can receive payments. For more information, check out this article: Verify test transaction.
I've also added these articles below to learn more about how to cancel or edit bill payments and new updates for Online Bill Pay.
Let me know if you have follow-up questions. I'm always here, ready to help. Keep safe!