6.3.2.8 Requesting a delivery stop by the UI

When a delivery has been requested by the UI as described in 6.3.2.7 in step 1, the delivery may be cancelled by the CancelDeliverRequest Method.

When the CancelDeliverRequest Method is called before the payment is collected by the payment service (step 3 in 6.3.2.7), the Method call should be successful. In that case, the payment service does not continue the deliver request and provides the corresponding status of the TransactionId in its TransactionProgress Variable.

When the CancelDeliverRequest Method is called while or after the payment gets collected by the payment service (step 3 in 6.3.2.7), but before requesting the deliver in the machine engine, and the payment service is able to refund the payment, the Method call should be successful. In that case, the payment service triggers a refund, does not continue the deliver request and provides the corresponding status of the TransactionId in its TransactionProgress Variable.

When the CancelDeliverRequest Method is called after the payment service has called the Deliver Method of the machine engine (step 4 in 6.3.2.7), the Method call should fail and no cancellation is possible anymore.