Mistakes that stoped you from getting commission!?

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1. You will not receive commission on purchases your make for yourself. 2. You are not supposed to receive commission on purchases your relatives or friends make but I don't know how enforceable this is. 3. You will not receive commission if you don't include your associates id properly. Basically, you should not tinker with the HTML you get from Amazon's Associate Central. 4. You will not receive commission if the customer does not purchase within the cookie lifetime