Some carriers charge for labels when you create them (ex: USPS). You can void labels to get a refund for them.
Note: you can’t void USPS test labels nor USPS labels that have already been scanned by USPS.
You must request a refund within the following number of days to qualify for a refund:
Stamps.com = 28 days
Express 1 = 10 days
Endicia = 30 days
Errors are generally returned by the carrier if the label was created past the void deadline or the shipment was already delivered to its final destination.
For Stamps.com, the refund will be credited to your postage account within 3-4 weeks of the request.
UPS and FedEx labels are only charged once scanned. Therefore, you might not need to void labels for them.
Learn more about voiding labels in the API documentation
Order Status on the Selling Channel
You will need to manually update the order on your selling channel if you void an order and want it to appear as something other than Shipped/Completed (or whatever your particular selling channel's status happens to be). If you re-ship that order, you may also need to update your selling channel manually with the new tracking information as most selling channels do not allow overriding tracking information via their API.
To confirm label voids, refund status, or postage billing history, please contact your carrier directly.