Unbelievable amount of information in just a few posts.
Thank you AsukaCredit and jamesbondd, this info is pure gold for me and other members too.
I will now try to answer some of the AsukaCredit's questions:
-You mentioned wanting to try a centurion. Why? Try thinking about this process rationally-why would anyone with a centurion card try to buy a $50 game code? that is much too cheap for someone with such a card. success in carding comes when you successfully impersonate the individual, and this can be done so long as you use common sense. If you're looking to purchase something like a $50 code, then use a standard credit card and maybe you'll see higher success
I was just reading random info everywhere and I didn't realize that centurions are for high-ticket items and pro carders. Standard credit card it is from now on.
-Do you have a good burner number for verification calls? This can be crucial in many instances. A good number mind you-not some virtual shit.
Unfortunately NO. I am in Europe, currently I don't know how to get an US pre-paid SIM, I will look into this, thank you.
-5socks is a good socks5 provider. How are you using the socks? I like to use the software proxifier and run everything through that as mozilla can leak stuff randomly I find. Are you checking for DNS leaks? Go here to check http://dnsleak.com/ you can enable "resolution through proxy" in the proxifier settings to use that proxy's DNS
Yes, at this part I am careful, I use proxifier and firefow and set proxy sock in BOTH of them, then check with check2ip.com, and whoer.net and 3-4 other checkers and adjust everything (time zone, java, flash etc.) until everything is green
-If all of the above sounds like too much work for you...
Not at all, you have just filled the gaps in my setup

Actually, I was doing similar thing on gift code sites. Created an account, and randomly browsed the website, logout, leave it for an hour and get back and try to card. But chatting and leaving it for a day or two sounds reasonable.
How do you search for cardable site? Go through them all until you hit the winner?
I was doing "10th page of the google search result shop" method.
Also, what about using non-US CCs? I see they're more expensive on jstash, must be the reason for that? German CC, German socks and German site? Hm?
Cheers!