Linking an payment to an invoice not created yet

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In QuickBooks Online (QBO), we can create a sales receipt any time your customer immediately pays for products or services at the time of sale. This is in contrast to creating an invoice, which you give to customers who plan to pay for their purchases later on. Here's how to create sales receipts:

1. Click the + New Plus icon.
2. Select Sales receipt
3. Choose the customer from the Customer dropdown. If you haven't set them up in QuickBooks yet, tap Add a new customer.
4. Enter the sales info, such as the payment method.
5. Enter line items for the products and services you sold.
6. When you're done, press Save and send to email the receipt.

Also, we can receive money in QuickBooks without an invoice created by creating a bank deposit in QuickBooks. Here's how you can do it:

1. Click the +New button.
2. Under Other, select Bank deposit.
3. Select an Account from the drop-down.
4. Enter information in the Add funds to this deposit section.
5. Once done, hit Save and new.

For future reference, you can also combine invoices/transactions with a bank deposit in QuickBooks.Feel free to visit our Banking page for more insights about managing your bank transactions.

I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Please reply to this post and I'll get back to you. Take care always.