Business Rules determine whether a check number, source code, and reason code are required for a subscriber payment. Business Rules also determine the default source code, reason code, and bank, the number of days a payment can be backdated, whether a payment should auto-start a former subscriber, the draw adjust code to be used when a payment converts a subscriber from carrier collect to office pay, and (when this takes place) the number of days after expiration that the expire date should default as the effective date. Finally, Business Rules determine the processing vendor for credit card payments.