If not using one of the automated payment gateways you need to manually add the payment.
Enter the username in the search box on the left. Then Go to
Billing > Account Statements > Add New > Select Payment for Transaction Type > enter a description > Enter Amount > Save
If the amount entered covers the outstanding invoice then it will be marked as paid and the invoice sent to the customer via email.
Article ID: 1559, Created: August 14, 2003 at 11:38 AM, Modified: October 15, 2009 at 9:29 AM