To use the Billing API, you should understand the following key concepts:

Billing account

A billing account, which is identified by a Rackspace Account Number, is a ledger of charges and payments for products and services purchased or consumed by a customer, and is the source of the balance of the account and invoices. It also includes usage and payment history, responsible parties, contact information, and preferences.


A Rackspace account number (RAN) is a universal identifier used to reference a customer billing account.

Purchase order

A purchase order (PO) is a commercial document that is the first official offer issued by a buyer to a seller. It indicates types, quantities, and agreed prices for products or services. and is used to control the purchase of products and services from external suppliers. Our invoices can accommodate purchase order numbers provided by the customers.


A payment is something (typically money) that customers exchange with a supplier to pay for invoiced s goods or services.


An invoice, bill, or tab is a commercial document issued by a seller to a buyer, relating to a sales transaction. It indicates the products, quantities, and agreed prices for products or services that the seller provided the buyer.


Refunds are issued to customers whenever a supplier owes them money for variety of reasons.