Ok,  so I bought one of these amazon codes and here's my experience.  First,  I paid the bitcoin to the address on the link....then I waited for a confirmation.  Afterwards;  I checked the tab where I had bought it and it said to check my email.  I did and I found an Amazon code in it.  I copied the code to my clipboard and went to Amazon and went the the gift card redeem page.  Then I pasted the code...and it worked!  I got a $100 Amazon code for $70! Thanks op!!!