I found an official post from a g2a representative on reddit that addresses this issue. Click here to read it. My answer here will be based on this reply.
The answer here is: it depends.
The general idea is that yes, it is possible to pay on g2a using prepaid cards. What gift cards does g2a accept? Probably every popular one.
However, it is also entirely possible that these cards might be rejected by the systems on the marketplace.
In this case you will have to either try again and again until the card works (heh, brute force and stuff like that works sometimes, so why the heck not, especially if it is a temporary error) or simply find a more suitable payment method for yourself if nothing else works (though I understand that if you have a prepaid card, this is the thing you want to use instead of anything else, but hey, you might simply try using it elsewhere).
G2a’s representative suggested the latter, that is using a different payment method (Skrill in this case, because the OP said they don’t like using PayPal, since they don’t want to give out their SSN). Well, it’s definitely a viable option here, as g2a pay used to boast that they support, like, well over two hundred different options, ranging from the most popular ones, like debit cards, to some obscure local stuff.
Another user in this thread suggested buying a prepaid card that is specifically designated as the one for online payments. This might be a good solution, but I cannot guarantee it will 100% work.
So, to sum things up here:
- Yes, you can use prepaid gift cards on g2a.
- Yes, it is entirely possible that they might be rejected by g2a for whatever reason, usually because of some system issue.
- Yes, you might try alleviating the situation by getting a prepaid card that is meant for online purchases, but I cannot guarantee this will work in every case.
- It is probably better if you try a more reliable payment method, especially one of the most popular ones, a debit card, maybe?
- But if it prepaid cards are the ones you want to use, then go ahead. You can always contact g2a’s support for help if something goes wrong with your payment.