Hello there, Dar16.

Thank you for posting in the Community. When you received the payment, did you send an invoice link for the payment option?

Once it's linked to QuickBooks Online, it will applied automatically to the invoice. Let me show you another way to locate the customer and identify their payment method.

Let me guide you on how to locate the customer's payment information using the Merchant Service Center.

Here's how:

1. Log in to the Merchant service center.
2. Go to Activity & Reports.
3. Click Transactions or Deposits.

Find the deposits from Intuit based on the date and amount matching your bank statement. Click on the deposit to view the individual payments that make up that deposit. The payment details should show the customer name and invoice number(s) to which the payment was applied.

To learn more about the process, check out this article: Access and manage your QuickBooks Payments account.

As always, you can visit this link on how to reconcile an account in QuickBooks Online if you need tips and related articles in the future. 

Let me know how it goes. I want to make sure this is resolved, and I'll be right here if you need anything else. Have a lovely day!