moving to trader feedback
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Eloyman transfered 42m for me in one trade. So, I doubt he would scam a small 900k...
When you are buying a pin, the proper thing to do is to let the MM go on your account. If you do not completely trust the MM, you could always just not log out of your account in-game. The MM only needs to access the out of game account, so stay logged in and he wont be able to get i the actual game.
Whoever mentioned the link thing, you are also right. There is a certain link that you can give the MM that will make it so that they are already logged in on your account when they click it. This way, they don;t actually know your information. For a guide on this, see the guide section of RuneCore.