Hi there, lrobertson.
If your customer directly deposited the payment to your account, I’d suggest reaching out to them to verify when the payment was deposited. However, if you’re using our Merchant Service you can log in and check the status of the payment there. Here's how:
Also, I've added an article on how to find and fix payments missing in QuickBooks.
Let me know if you're able to locate the payment. I'll be right here if you have additional concerns.