I wanted to know that when I see advertisements on my hubs,does that mean I will be paid if someone clicks on those adds? or the payment is only maid if someone clicks on amazon product displayed on my hub and buy?
You have to be enrolled in the program and insert your code in the affiliate area inside your account. Adsense pays per click, Amazon per sale. Amazon cookies are 24 hours so your visitor must by right away.
HubPages keeps 40% as their cut if you participate and 100% if you do not. That's how they profit from the site.
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