Good morning, @Lisa617.
Welcome to the Community. I'm here to point you in the right direction for matching credit card payments to the transactions entered in QuickBooks Online (QBO).
Customers that pay through the sent invoice should automatically match to the transactions in the QuickBooks system. If it doesn't match directly, you'll need to give us a call.
Please also note that payments that you enter directly to the Merchant Center don't directly match to your QuickBooks transactions.
You can contact our QuickBooks Payments Team to correct the setup of your account. You can reach them through this article (scroll-down to QuickBooks Payments support):
If I can be of further assistance, I'm just a post away. The Community Team is on a lookout for your response on this thread.