回複：even that's possible, I bet no one will use it

Payment voucher is a kind of prepaid plan which is very popular in America, you pay for certain services( such as processing I-485,131,765) at today's price, you can use those services at any time within certain numbers of years in the future, or you can get your money back. By this way, I think USCIS don't have to violate current immigration law to make up their mistakes meanwhile offering some financial incentives to the frustrated July filers.