CPA (Cost per acquisition)

Advertising model where the marketer pays for a specific user action, such as account registration, social sharing, purchase, or a reservation instead of paying for installs, views or clicks.

However, cost per acquisiton is a financial measurement that measures the cost of acquiring customers who pay at cost per acquisition/acquisition. Payment is made for any action determined in the Cost per action. In other words, there is absolutely no requirement to make the payment.