Conceptual model

The concept is very simple:

1. You supply the customers and the product plans of your business.
2. You subscribe your customers to a product plan.
3. Upodi charges according to your product plan and creates the invoices.

Upodi definition of a subscription:

A subscription inherits the terms from the product plan and all the charges (products) available to the subscriber. A product plan can contain several different charges with different pricing models and billing cycles. Each subscriber may only subscribe to some of the available charges.