12.2 Where it lives

A machine gets a folder, as a train does, in the library beside the trains (Organize machines in a project):

Shopfront.Core/
└── Machines/
    └── Checkout/
        ├── CheckoutMachine.cs     the states, the events and the rules on them
        ├── CheckoutState.cs
        ├── CheckoutTrigger.cs
        ├── CheckoutContext.cs     what a checkout holds
        └── Models/                each event's input, and what the context is made of

SDK Reference

Machine | Rules | AddStateMachines | Machines over GraphQL | UsePersistedOperations | trax CLI

Next: 12.3 Packages