Cost Per Action or CPA (sometimes known as Pay Per Action or PPA; also Cost Per Conversion) is an online advertising pricing model, where the advertiser pays for each specified action – this could include (but not limited too): an impression, click, form submit (e.g, contact request, newsletter sign up, registration etc), double opt-in or sale.

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Cost per action
Definition of "Cost per action" by Chat GPT: Cost per action (CPA) is a type of online advertising pricing model where advertisers pay a fee for each specified action, such as a sale, lead, or click, generated by a user who clicks on an advertisement. The specified action is typically predefined by the advertiser and agreed upon with the publisher or advertising network. CPA is often used in performance-based advertising campaigns where the desired result is a measurable action instead of just a simple click or impression.
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