Glad to hear from you here in the COmmunity, @vitanovabookkeeping.

Customers can pay you too much for several reasons. When this happens, you can use the credit toward an invoice, refund the customer, or enter the overpayment as a tip.

I'll provide you the steps on how to give credit so you don't have to send a cash refund.

Here are the steps on how to apply for a credit:

Apply the credit to an invoice you already created

1. Click on + New.
2. Go to Receive payment.
3. Select the customer, then the credit and the invoice.
4. Choose either Save and New or Save and Close.

Apply the credit to a new invoice

1. Select + New.
2. Select Invoice.
3. Create the invoice.
4. Select + New. Then select Receive payment.
5. Select the credit and then Save and New or Save and Close.

Tip: Set up customer credits to apply to future payments by default.

1. Go to Settings ⚙ and select Account and Settings.
2. Select Advanced.
3. In the Automation section, select Edit, and select Automatically apply for credits.

You can also check on how to create and apply credit memos or delayed credits in QuickBooks Online.

Get back to me if you have any additional questions about giving credits. I'm just a post away.