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In almost all cases, you are paid for the lead whether or not the person filling out the application is 'closed'. For example: for a completed mortgage application you may be paid $25. You are paid the commission even if the person filling out the application does not actually get the loan.
A completed form is generally shorter in length and depth of questions, think inquiring if the company is hiring.
Generally programs with applications will pay higher rates since their forms are longer. However, don't just look at the price. The conversion rate is really the deciding factor on how much you'll earn in the end.