Cashless concessions and selling debit cards at the box office

Our venue manager wants to go cashless at food and beverage. He wants our box office to sell prepaid debit cards to patrons who only have cash so that they can then take to food and beverage to use. Does anyone else do this now? What work / equipment / staffing/ banking / anything else should be planned for to set this up? Has anyone thought about or been successful in implementing a sales program of debit cards or gift cards or vouchers to be used in such a way?  Any suggestions welcome!