US Patent 8027915 Flexible advertiser billing system with mixed postpayment and prepayment capabilities

A computer-implemented method of providing advertising to a client includes establishing a billing experience between a client and a provider, providing advertising opportunities to the client on at least one of a continual basis and a periodic basis, evaluating a credit risk associated with the client at least one of periodically and upon occurrence of an event, and modifying the billing experience automatically based on the credit risk associated with the client.