Museum - Ticket amounts applied to Membership

Hello Everyone! 

I have a question for anyone who has this process, that guests can apply todays ticket to a membership. Basically we apply the money from the ticket sale to the Membership and then they pay the difference. HOWEVER, I realized that to do this we have to return the tickets, which then deletes the attendance record skewing our attendance data. Does any other institution have this sort of benefit and if so, how to do apply this?

Thanks! 

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