In pay-per-lead advertising, the advertiser pays for each sales lead generated. For example, an advertiser might pay for every visitor that clicked on a site and then filled out a form.
an affiliate program where the affiliate receives a commission for each sales lead that they generate for a merchant website. Examples of these consist of: free trials, completed surveys, contests joined, etc.
The commission structure where the merchant pays the affiliate a flat fee for each qualified lead (customer) that is referred to the merchant's Web site.