It's nice to see you here, 

I'm here to make sure you'll be able to change the payment to the right vendor in QuickBooks Online.

If you entered the payment to the incorrect vendor, you'll be able to void or delete its payment in QuickBooks Online. I'll show you the step-by-step process:

To delete the vendor's payment

1. On the left tab menu, click Expenses.
2. Select Vendors.
3. Double-click the name of your vendor.
4. Look for the payment you applied.
5. Click the View/Edit drop-down arrow.
6. Select Delete.
7. Click Yes.

Once done, you can now make a payment to the right vendor in Online Bill Pay.

Additionally, you can always access any vendor reports to track all the data you've entered into the system. Then customize it to show specific details. 

Lastly, I've also included these helpful articles on how to manage vendor transactions, modify payment methods, and handle Online Bill Pay:

• What is the difference between bills, checks, and expenses?
• What is Online Bill Pay?

I'm always here if you need further assistance with your vendor payments. Have a good one.