Hi there, @ lxsgreen.

You can edit the payment with the correct customer name and amount. You may open the payments and the transaction history to check the changes.

Here's how to do it:

1. In QBO, go to the Sales menu at the left pane to get to the Customers page.
2. Click the customer's name to open the Transaction List.
3. Locate the payment and select it to open.
4. Rename the customer and enter the amount.
5. Hit Yes to confirm. The customer will have an unapplied payment which you can either delete or apply to future invoice(s).

Once done you can link the invoice to the payment and delete the incorrect payment.

I'm also adding this article that tackles how to let customers pay their invoices online for future reference: Take and process payments in QuickBooks Online.

 That should get you pointed in the right direction. Feel free to get in touch with me if you need anything else. I’m always here to help. Thanks for dropping by and take care!