I have not used mine yet but I believe you can either print them and give it to them when you get there or you can pull the voucher up on your phone and show them once you arrive.
Yes you can. Just call ahead and be ready to give the voucher code. Either way, even when you go to the theater in person, you're able to select your seats. Hope this helps.
Im not certain but I believe you can apply the code online or in person
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