This operation cancels or voids a shipment label that has not been processed by the carrier. When you cancel an unused prepaid shipment label, the API initiates a request for an electronic refund.

Key Considerations

• Cancelation must occur before the shipment is picked up or processed by the carrier.
• Refunds are only applicable for unused labels. Voiding a used label may result in penalties or billing.
  
• USPS:
  • Cancel unused USPS prepaid labels within 30 days of printing to start the refund process.
  • Refund requests are processed within 14 business days from the date the refund was requested, provided the label has not been used.
  • Approved refunds are automatically credited to the account you used to pay for the label.
  • Note: USPS considers it a federal offense to induct a label that has already been refunded.
  • Note: Refunds are not available for First-Class Mail letters and flats.
  • Note: Refunds are subject to the policies of the applicable carrier.
• For unused post-paid labels, you must void them. Voiding avoids billing for the label and allows the carrier to maintain an accurate count for pickups.
• Always destroy voided labels to prevent accidental use. If a voided label is shipped, you will be billed for the label.
• Once a refund has been claimed, you cannot use the shipping label for sending packages. It will be rejected.