You do get a card when redeeming a voucher, I believe, but if/when you link either the voucher or your actual card ticket to your My Disney Experience account you will be given the option to order a MagicBand in the same fashion as a resort guest does online. It will be shipped to you with a nice little slider and your AP discount card, which you can use for parking and such (although the plastic ticket+ID is still acceptable as well).