Pay Per Sale or Action (PPS/PPA) programs

How does Pay-per-Sale Search Engine Marketing work?

Pay-per-Sale Search Engine Marketing is a variant of pay-per-sale, whereby the traffic source is largely search engine traffic such as that from Google's AdWords "pay-per click" system. The business model means that merchants no longer bear the cost of "pay-per-click"; instead, the "pay-per-sale" provider takes on the risk of conversion.

CPS belongs to the larger family of CPA, which is different from Cost Per Impression in which advertisers pay every time their advertisement is displayed, irrespective of whether the display created any action on the part of reader or visitor to the website or not.