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Bear in mind that you cannot include referral codes in your posts, as per the forum rules:
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> 4. No referral code (ref link) spam. [1] <
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You may, if Im right, include them in your signature, but not in your posts. Some people manage them through PMs, but both partys should really be in clear agreement over it (i.e. open post in public), in order to avoid getting reported for sending spam via PMs.