The only information that should be passed on are Steam usernames.
For anyone unfamiliar, Steam only allows users to send gifts to people in their friends list. Once you enter your friends list on your Steam account, there are three ways to add someone to that list.
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The donor or the recipient (only person needs to do this) can search for the other person’s Steam username, which I presume @dwsnee will be handing out at the end of the giveaway period when donors and recipients are correctly matched. After this, the friend request only needs to be accepted for the donor to finally be able to gift a game.
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Either the donor or the recipient can share their 9-digit friend code, which the other person will put into a box located beneath their own friend code, and voila. Now all that’s needed is for the other person to accept the friend request.
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Either the donor or the recipient can share a link that will lead the donor to a friend request page. The other user must then agree to add the donor to their friends list, and voila.
After the friend requests are all accepted and the donor has a shiny new friend in their list, the donor can then go to the individual games’ store page and add it to their cart, click on the ‘purchase as a gift’ button, and a list of all the donor’s friends on Steam will appear. The donor must then scroll through the list to select the recipient’s Steam username, et voila. After that it’s just a matter of the donor choosing a payment method.
Technically, there’s a second method of going to the recipient’s wishlist and looking for the game on there, but this requires that the recipient’s wishlist be up to date, and in any case it leads you to the same cart page, so the former method is simply more direct.
If this all sounds confusing to you, then here’s an inexplicably long Business Insider article with pictures on how to add friends on Steam:
And here’s another article with pictures on how to purchase gifts on Steam in the first method I described above, also from Business Insider, also with an unnecessary amount of preface, lol: