After completing the order, I realized the voucher stated that a printed copy was required for redemption. However, upon arrival, I was able to show the voucher on my phone to the ticket agent at the ticket booth. They wrote down the number from my phone, and I was able to redeem the tickets. When redeeming the tickets, you still need to wait in line with those purchasing tickets. Even though it was cherry blossom season, we entered two hours before closing, so there were noticeably fewer people, and we didn't have to wait. It's definitely worth going up to see during cherry blossom season; it's absolutely beautiful.