Contract

An agreement between a service provider and a consumer.

A contract is not formally represented within Jtrix--it is something which may well be arranged off-line or by some on-line means other than Jtrix.

However, an application may well keep a database of contracts and facilities available to the contractees. Then when a warrant is issued to the consumer it can contain a reference to the contract, and details can be updated as they use the service.