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Require 100 Hours of Service in College: Obama will establish a new American Opportunity Tax Credit that is worth $4,000 a year in exchange for 100 hours of public service a year.

Create the American Opportunity Tax Credit: Obama will make college affordable for all Americans by creating a new American Opportunity Tax Credit. This universal and fully refundable credit will ensure that the first $4,000 of a college education is completely free for most Americans, and will cover two-thirds the cost of tuition at the average public college or university and make community college tuition completely free for most students. Obama will also ensure that the tax credit is available to families at the time of enrollment by using prior year's tax data to deliver the credit when tuition is due.

The "payment" is a tax credit to offset college tuition. Incidentally, all of this info is available online.