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USPS eVS International Cancel Request REST API v3.1 - Followers

Shipping Government, Mail, Postal
The USPS eVS International Cancel Request API allows developers to remove an eVS label from processing as long as the request is made prior to 11:59 PM Central Time on the same day the label was created.

This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.