I want to sell amazon vouchers

[pissing]

I get amazon affiliate payments in vouchers and want to sell them for bitcoin.

I have read about using a mediator and seen the list of people who mediate but it still seems like there is so much can go wrong.

How would you see this process working? A 3rd party holds the voucher number while I get the money sent as coins and then the 3rd party lets the voucher go to the buyer?