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 digital advertising pricing model where advertisers pay a fee each time a specific action is completed, such as a sale, lead form submission, download, or other pre-defined conversion event. The cost is based on the number of actions taken by users in response to the advertiser's campaign, rather than just for clicks or impressions.
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