Activities are cost effective campaigns where payment is the most important payment is the goal}. Entity pay the result , and may be Customer redirect to web site To add the contact form or purchase a product or a service. Buyers may pay according to the following payment models: – CPC – cost per click – and the advertiser pays the advertising agency for such a click. ; CPA – cost per action – payment depends on the purchase of a product or sign up on the site, that is, created . touche pour clavier<br>