Hi there, W012. To resolve the unapplied payment, we can create a journal entry. Let me walk you through the process below.

This will move the payment from Accounts Payable to Accounts Receivable.

Here's how:

1. Go to Company. Then, select Make General Journal Entries.
2. Create a journal entry to debit Accounts Receivable and credit Accounts Payable for the overpayment amount.
3. Enter the date of the original transaction.
4. Debit Accounts Receivable for the customer and mention the customer's name.
5. Credit Accounts Payable for the same amount and note the customer’s name.

Then, apply the Journal entry to the unapplied payment.

1. Link the journal entry to the unapplied payment.
2. Go to Customer Center.
3. Select the customer and find the unapplied payment and the newly created journal entry.
4. Apply the journal entry to the unapplied payment to clear it.

Refer to this article for creating checks in QBDT.

Additionally, you can void the refund you've processed to your customers if there are any issues when processing it. Refer to this article.

Let me know if you have further concerns about managing your customer transactions. I'm here to help.