Pay per action (PPA) is a variation on pay per click adopted by many search engines. An advertiser pays a specified amount upon successful completion of some action (e.g., conversion, sales lead, or sale).
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| Cost Per Action or CPA - http://en.wikipedia.org/wiki/Cost_per_action Cost Per Action or CPA (sometimes known as Pay Per Action or PPA) is an online advertising pricing model, where the advertiser pays for each specified action (a purchase, a form submission, and so on) linked to the advertisement. |