... but I'm not sure if it works the same way outside the US. I'll gladly refund your Bitcoins if someone wants to experiment and it doesn't work.
I'm in Europe. If I buy a certificate from you and try to redeem it with my next purchase you want to know if it was accepted?
let me be your guinea-pig.
edit: i like how you use the block numbers to indicate time, when you'll dispatch the certificates. you're doing it right
edit2: no worky. explanation: the amazon certificate comes from Amazon Payments and they need to "verify" the account. part of the process is an US based address (country is hardcoded, seems no way for me to register with the amazon payments site and redeem the code)
down the email I read:
After accepting this payment you may:
* Use your Amazon Payments balance to shop on Amazon.com
...
not mentioning amazon.de or any site near me. test finished. might work for someone else outside of the US to shop and pay but not sure how they want to pass the redeeming/verification step where required country is US.
edit3: the exchange from btc to amazon payment was smooth. just like (or better than) buying btc with paypal back in april