G2A itself cannot be recommended at all due to the acceptance of fraud. I bought a gift card from a seller, who then provided me with a wrong code.
The contacted seller did not react at all and also the G2A support was not trying to help (only sending standard messages).
What make it clear that the marketplace is clearly not to recommend at all is when I posted a negative rating. Then magically the seller answered but demanded that I change my rating and not willing to do anything before.
And also that was completely ignored by the G2A support. They now send you to the police, in the hope that you give up then or after that give you more excuses.
Stay away from this market place