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In QuickBooks Online (QBO), a sales receipt is used when your customer pays you on the spot for goods or services. This is the reason why they're showing as paid. The option to pull up a report that shows unpaid sales receipt is currently unavailable.

However, based on the information you've shared above, I highly suggest creating an invoice instead. This is used when your customer agrees to pay you later. You can set up terms to indicate how long the customer has to pay. They won't show as paid unless you applied a payment using the Receive Payment option.

You can check out this article for more information about the difference between the two transactions: What is the difference between an invoice and a sales receipt.

Feel free to leave a comment below if you have any additional questions or concerns. I'm more than willing to help. Happy holidays!