If you want to burn it, first ask for the station manager as to assure that somebody who can potentially relay your manifestation of meaningful protests to upper management is actually watching you do it. Additionally, make sure you don't trigger a fire alarm. Perhaps the voucher has been printed with non toxic ink and the paper burns slowly enough. In that case you could buy the Armagnac and Cigar in the duty free and use the voucher to light the cigar. That would be stylish. In any case take a video and share it with us please :-D (The video, not the voucher, at least that's what I meant).
Should you choose to use it for access instead I hope you enjoy it. I would go for the ZRH E lounge myself. (You could burn it on the Terrace.)