To cancel a shipment, make a request to the Cancel a shipment endpoint and specify the shipment id you wish to cancel. The shipment stays in the system under its original ID, appearing in the Cancelled labels tab on the platform
Labels can also be cancelled from the Sendcloud platform on the “Created labels” tab.
Note: Cancelling a multicollo shipment (with multiple parcels) automatically cancels all associated parcels and their
labels.
Conditions for shipment cancellation
Not all announced shipments can be cancelled; success isn’t guaranteed and may be async based on shipment status. Each carrier will have different cancellation deadlines. Some carriers do not accept cancellation requests regardless of whether or not the shipment is cancelled within the deadline. You can find out more about cancellation deadlines and supporting carriers in our help center.
If you don’t manage to cancel a shipment within the deadline, don’t worry. You’ll be charged for the shipment, but if you cancel it within 42 days and it remains unshipped, the cost will automatically be reimbursed on your next invoice.
When the cost for a label is deducted, it will be clearly stated on your invoice. For more information see the help center. 
