Cost per action (CPA) requires users to click on an affiliate link and the network only pays if the user completes a required 'action', such as signing up for their subscription, take survey, download software, or filling a form. Udemy also offers a course on CPA marketing to optimize your revenue from it. There are many CPA affiliate networks to choose from
References: Earning Guys,
ClickBooth They are huge and have paid over $1 Billion to their network of affiliates. Opened in 2002, they have also been around longer than most other companies on this list.
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