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Campaigns are cost effective campaigns where payment is the most important payment is the goal}. Entity pay the result fee, and may be Customer redirect to web site or the contact form or purchase a product or a service. Buyers may pay according to the following payment models: - CPC - cost per click - and the advertiser pays the advertising agency for such a click. ; CPA - cost per action - payment depends on the purchase of a product or sign up on the site, that is, payment for the actual action taken . touches perdue