***
title: "RefundProcess"
generated: true
---------------
A RefundProcess is used to define the way the refund process works as in: what states a Refund can be
in, and how it may transition from one state to another. Using the `onTransitionStart()` hook, a
RefundProcess can perform checks before allowing a state transition to occur, and the `onTransitionEnd()`
hook allows logic to be executed after a state change.
For detailed description of the interface members, see the [StateMachineConfig](/current/core/reference/typescript-api/state-machine/state-machine-config#statemachineconfig) docs.
```ts title="Signature"
interface RefundProcess extends InjectableStrategy {
transitions?: Transitions & Partial>;
onTransitionStart?: OnTransitionStartFn;
onTransitionEnd?: OnTransitionEndFn;
onTransitionError?: OnTransitionErrorFn;
}
```
* Extends: [`InjectableStrategy`](/current/core/reference/typescript-api/common/injectable-strategy#injectablestrategy)