We would suggest creating a “Custom Band Fees” Product in Store > Add Items > Add a Product with the option Add Price at Checkout selected, as well as Enable Pay Later. You can then enter the amount they paid you.

Then, navigate to Accounting > Pay Later. There you will be able to select the Product to which you want to create an invoice and can send that invoice to the Member if needed.

Once you have the invoice created, go to Accounting > New Transaction, and from the Transaction Type dropdown menu select Accounts Receivable Payment to record the payment you received.

If there is a balance due, the invoice will remain on the Accounts Receivable report and the balance due in the Accounts Receivable ledger.