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: