Before I answer the question, I’ll explain what this whole goldmine thing is.
Basically, it’s a legitimate way for you to earn some extra moolah through promoting products sold on g2a marketplace elsewhere.
You do that by creating the so-called reflinks (or reference links) that you then post someplace else. Once someone clicks that link, they get a cookie file that is valid for 24 hours. And if they buy something on g2a within that time, you’ll get a cut: 5% for digital products and 4% for physical products. You can even promote g2a plus subscriptions. If someone subscribes for a month, you get €1. If it’s 12 months, your cut will be €2.
You can then either withdraw whatever you earned or just use this money on g2a to buy stuff.
But is it legit, though?
Yes, totally! You probably won’t make millions, mind you, but you might just earn enough to buy a couple of sweet games for your collection.
People usually post reflinks on YouTube in video descriptions (streamers use this as a source of extra income) or discussion forums. The thing is that you should respect the community that you want to send your links to. Spamming is forbidden, so you should refrain from that (unless you want to get banned straight away, of course). I think it’s best if you read the guidelines of a particular group/forum thoroughly or simply just ask the mods or admins about posting such links. For starters, you might start with sending reflinks to your friends who might be interested in checking g2a out or looking for a particular game or product.
Either way, there are some goldmine guides on how to earn through this service, so if you’re interested in learning more about this, Google’s your friend. Keep in mind though that the current version of goldmine, 2.0, features a lot of changes and such guides may no longer be up to date. If you need reliable info, I suppose it’s best if you check out goldmine’s website.