How do I record cash payment of an invoice?

Let's navigate together in recording the cash payment of your customer in QuickBooks Online, @speakucreativell.

When your customer pays an invoice using cash, we can record it through Receive Payments. 

Here's how:

1. On the left panel, click + New, then select Receive Payment.
2. From the Customer dropdown, choose the name of the customer.
3. Select Cash in the Payment method dropdown.
4. From the Deposit to dropdown, select the account you put the payment into.  
5. Click the checkbox for the invoice you're recording the payment for in the Outstanding Transactions.
6. You can enter a Reference number and Memo if needed.
7. Once done, select Save and Close.

If you need to record a partial payment, you can follow the same steps and enter the amount your customer paid in the Amount received field. Once done, you can run a Customer Balance Summary report to see the remaining balance of your customer.

Moreover, I've added this article to help you personalize your invoices: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Additionally, you can check out this article to learn how to convert an estimate into an invoice Convert an estimate into an invoice in QuickBooks Online.

Please let me know if you need further assistance in recording another payment or any QuickBooks-related queries. I'll be happy to provide additional guidance. Keep safe.