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How can I void a label that a customer did not use?

Shippo

Shippo automatically voids and refunds unused labels after 30 days for their USPS-master account and selected other accounts. See here for details https://support.goshippo.com/hc/en-us/articles/201772785-Refund-a-Label#h_aced7663-ca22-4ec2-88c5-05f1b82f400b​

ShipStation

ShipStation requires to manually void labels inside the ShipStation dashboard within 28 days for their Stamps.com account. See here for details https://help.shipstation.com/hc/en-us/articles/360026157751-Void-Labels#UUID-997e8eed-f324-947f-f8c3-d80f909e18a6.