Financial data processing system

Claim 1

An integrated billing document comprising two portions, one portion being an invoice or billing document, and the other portion being a check document, the voice document comprising a printed invoice indicating a matter billed, and including in human readable form a billing entity's name and address, a customer's name and address, the customer's account number at the billing entity, and the total dollar amount due, and the check document being in the form of a bank check having a first side and a second side with the first side having printed thereon in human readable form the customer's name and address as the payer, the bank name and address of the payer's bank the payer's bank account number, the account number of the customer/payer at the billing entity, the dollar amount due as indicated on the invoice document, and the matter billed as indicated on the invoice document, the first side having printed thereon in machine readable form the payer's bank transit/routing number, the payer's bank account number, the dollar amount to be paid, and the payer's account number at the billing entity, the first side of the check document further having date and signature portions left blank to be added by the payer at the time the check document is signed by the payer, and the second side of the check document having printed thereon the endorsement of the billing entity including the name of the billing entity, the name of the billing entity's depository bank, the account number of the billing entity at the depository bank, and the transit/routing number of the depository bank.