A target action here is a purchase made by a user. It includes them making an order, paying, receiving the goods, and not returning within the return period. Most common among online stores distributing specific goods. If a reward is a purchase amount interest, the publisher gets the share of the cart amount (rather than of the cost of one product they promoted). For instance, the publisher promoted a new lash mascara, but a user also bought a powder on the advertiser's website. Therefore, the publisher will get a percentage of the overall purchase amount rather than of the mascara's cost.