I'm here to help and ensure that your questions are addressed accordingly.
For me to be able to provide you with the right issue resolution, could you please tell me where exactly in the invoice you see the payment tab? It would be best if you can send me a screenshot as well.
In the meantime, you can follow the steps below to return a customer's payment.
Click + New in the left panel.
Select the Refund receipt.
Select the customer you want to refund from the Customer ▼ drop-down.
Fill out the fields using the info from the original sale.
Choose which payment method and account you wish to refund the customer from. Note: You can't refund an ACH payment to the customer’s bank account. You'll need to choose another refund method (cash, check, or store credit).
Select Save and close.
You can get more details about this process in this article: Void or refund customer payments in QuickBooks Online. Also, this article provides information about voiding a paid invoice as well as things to remember when refunding customer payments in QuickBooks Online.
Feel free to drop me a reply below if you have any other concerns. I'll zip right back to help you out. Have a good one.
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