How do I receive a customers payment made through Quickbooks?

Welcome to the Community, @bctutor.  I'd be glad to share some steps on how you can receive payments in QuickBooks Online (QBO).

Here's how you can record payments for a single invoice:
 

1. Select + New, then select Receive payment.
2. From the Customer dropdown, select the name of your customer.
3. From the Payment method dropdown, select the payment method.
4. Select the account you put the payment into from the Deposit to dropdown. 
5. In the Outstanding Transactions section, select the checkbox for the invoice you're recording the payment for.
6. Enter the Reference no. and Memo if you need to.
7. Once done, select Save and close.

Furthermore, you can also read this article to learn how you can accept electronic payments like credit cards and ACH transactions directly from an invoice using QuickBooks Payments.

It would be my pleasure to help you further if you have additional concerns about receiving payments. Take care and have a great day!