It's my pleasure to help you find invoices and received payments, tirisanoprinters.
You can select the +New tab to locate the transaction. Under Customers, you can click the Invoice. You can also navigate to the Menu drop-down and hover your mouse to Sales, then Invoices.
Once created, you can then Receive payment from the +New. Opening an invoice from the magnifying glass will also show a button for the same feature.
I'm adding some resources to learn more about them:
Here's another reference in case you want to inform customers about impending due dates: Send invoice reminders automatically or manually in QuickBooks Online.
Let me know if you have other concerns about managing invoices and payments. I'll be here to address them for you. Have a great day!