1. A method for providing supplemental payment information, comprising: receiving, using a payment processor, at least one payment file from at least one payor; receiving, using a supplemental information processor, at least one supplemental payment information file from the at least one payor or at least one provider; associating, using an association processor, the at least one supplemental payment information file with a corresponding at least one payment file and further identifying a corresponding account and a corresponding account holder; and determining, using a discrepancy determination processor, whether there is a payment discrepancy between the at least one supplemental payment information file and the corresponding at least one payment file; preparing, using an explanation processor, at least one payment explanation file, wherein the payment explanation file comprises data or information based on the at least one supplemental payment information file and the corresponding at least one payment file and an explanation of the payment discrepancy; and providing, using the explanation processor, the explanation of the payment discrepancy to the account holder.