The USPS Customs Forms (CP72V3) API allows developers to fill out PS Form 2976-A, Customs Declaration and Dispatch Note CP 72. This form is used on all Express Mail International and Priority Mail International parcels, except for Priority Mail International Flat Rate Envelopes and Small Flat Rate Boxes.
This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.
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