Cancel and refund an order

[lunika]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.

We want to be able to cancel an order and refund it from the BO. Now we have to manually refund the transaction on the payment provider and then cancel it in the BO.
With the payment schedule, we also to have managed all paid installments on the refund action

Describe the solution you'd like

A button on the order should be available to cancel. Once the order cancel, then a new button to refund the customer should be available. So the button refund should not be available while the order state is not canceled.
A new state refund should be added in the state machine, the transition is only available from the canceled state and the action is to refund all paid installments.

Discovery, Documentation, Adoption, Migration Strategy

Payzen endpoint to use to cancel or refund a transaction : https://payzen.io/fr-FR/rest/V4.0/api/playground/Transaction/CancelOrRefund