Problem
You are trying to export a payment but you are receiving an error: "Object "___" specified in the request cannot be found" because the invoice was already exported and changes were made to the invoice in QuickBooks.
Solution
The invoice you have previously exported may have been changed or deleted. To resolve this:
Bypass the payment, invoice or adjustment invoice.
Create the invoice manually in Quickbooks:
In Quickbooks, go to the navigation bar and click Customer.
From the dropdown menu, select Receive payment.
In the Customer Payment screen, select the customer and specify the payment.