Abstract: A system of billing for subscription products and services from multiple vendors across multiple layers of buyers and sellers is presented. Each subscription is charged according to a rate plan, which may include volume, tiered, or usage-based pricing. In billing for subscriptions, sellers may use a single standard rate plan for each product, or may use a variety of rate plans depending on the type of customer, time period, or other attributes. The rate plans stored in the system are dynamic, such that a seller can instantly modify an existing rate plan in order to create a new rate plan.