Compensation methods can vary from one online affiliate program to another, and from one merchant to another.
Internet affiliate programs can be as unique as each merchant. If a merchant is concentrating on building brand awareness, he or she might pay for each click-through, while another might pay only for sales made. Yet another may by trying to drive up newsletter subscription rates and offer compensation for each new subscriber. Be wary of merchants that promise huge commissions as that may indicate that the merchant is having a hard time making sales, which would result in little income for your effort.
Most web site affiliate programs have a minimum payment threshold and will issue you a check within so many days of the end of each month in which you meet the threshold.