Yes, you're right, @Anne16720. I'll tackle the details of applying credit to a sales order in QuickBooks Desktop (QBDT).

At this time, QuickBooks Payments doesn't support recording prepayments. Instead, you'll need to manually record them in QBDT. It's also important to note that you can't apply the credit directly to a sales order. You'll have to convert it first into an invoice. To do that, please refer to Step 3 provided by the previous agent.

Additionally, check out this article to learn when QuickBooks Payments deposits customer payments into your bank account: Find out when QuickBooks Payments deposits customer payments.

Keep me in the loop for any further questions concerning prepayments. The Community is always ready to address any queries you have. Take care.