ok so my friend is trying to buy me a 10$ amazon giftcard but he is from the uk will it still work if i put it on my acc or is there a way to convert it
Interesting, could just use a US VPN and go to Amazon.com and buy it that way, Amazon's servers would pick you up as a US citizen thus allowing him to buy it for you.
If you're from the US and he trusts you enough and you trust him, you could allow him on your PC using teamviewer and he could check out on your PC. Just an idea.