This help article will demonstrate how to check completed (Done) sessions against the invoices they're associated with. Instantly know which invoice was used to pay for sessions.
Click the Members tab
Select any member's profile
Click the Account tab
Select Remaining
There is now a Used link displayed on the member's remaining area. When clicked, this will display the member's activites tab with a list of the completed sessions and the associated invoice number(s).
If the invoice number (ID) is clicked, that particular invoice will be displayed.