If you have backdated any payments on the current day they are not reflected in the current Day End report.
Backdated payments will appear on the Day End report for the date you entered under the Summary section but not under the Transaction page listing.
Use the Payment Received Report and Sales Reports.
There are several places you can pay outstanding invoices.
a. Go to Home>$Accounting>Billing section - Receivables.
b. Search for the patient. To pay 1 item, click the blue icon to the left of the item and select Pay Invoice.