How do you apply - clients credit if a refund is done by cash. - refund receipt is done, but the credit is still available?

It's nice to hear from you, accounts319.

Let's make sure you'll be able to link the refund to customer's credit.

There are ways to record the customer's refund depends on the situation. In your case, we'll have to create an expense to record your customer's refund. Then, link the refund to the credit. This is how we can offset open balance.

With that, it's okay to delete the refund receipt you've created earlier. Open the refund receipt > click More > Delete. Afterward, let's start working it together by recording an expense first. Here's how:

1. Go to the +New button.
2. Select Expense under Supplier.
3. Click the Payee drop-down arrow and choose the customer you want to refund.
4. Select bank account.
5. On the first line of the Category column, select Account Receivable.
6. Enter the refund amount in the Amount field. Also, you can enter other required details as long as you think it's needed.
7. Then, Save and Close.

Once done, let's go to the Receive payment page and select the customer name you used when creating expense. Same thing when you refund, add the details you as long as it's needed. Under the Outstanding Transaction section, you'll see the transaction you've created. To link the refund, we'll need to ensure that the expense is ticked. Otherwise, the credit will remain available.

Let's see this sample screenshot:

Then, you can run the Transaction List by Customer report customize it as much as you want to view their data. I'd suggest adding the A/R Paid in the filter section to get these things.

Stay in touch if you have other questions about managing transactions in QuickBooks Online. I'm here to back you up. Take care!