CPA Oct 25, 2019 ALL0-9ABCDEFGHIJKLMNOPQRSTUVWXYZ« Back to Glossary IndexCost per Action occurs when the advertiser only pays when an agreed action has been performed, such as making a purchase or requesting more information. Related Articles: Have You Tapped into In-App Advertising?10 Tried and Tested Tips to Promote your Browser Extension« Back to Glossary Index