online application - voucher payment option

As an incentive for potential students who attend an Open House, we offer all attendees a printed "application fee voucher" to use in the future when completing the application for admission. Each voucher has a unique ID# that the applicant notes on the paper application, in lieu of including the application fee. This system works fine for the paper applications, but we were wondering if there's any way this system could be used with the online application? Right now, applicants have to enter their credit card data to submit the application. Could they simply put their voucher # in instead? 


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