When you purchase some amount of STC coin, you will get bonus (extra) 5% of that price that you purchase. Also when each person who uses your link buy some amount of STC, you will get 30% of that amount, added to your account. Here is my referral code: https://studentcoin.cash/?ref=Sxrsloe8fu .
It is a great thing, isn’t it? 
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Best regards to everyone!