Nowdays Rewards1 will fulfill custom requests of G2A steam gifts (the links and the keys too I guess). When ordering specify them accurately the offer from G2A that you want and to be sure give them a couple of options if that offer gets taken before it is fulfilled so that things go as fast as possible. The link will be sent to your email and from there you will be able to go to the link and log in to steam and redeem your game. I hope this was helpful.