The USPS Customs Forms (CN22V2) API allows developers to fill out PS Form 2976, Customs Declaration CN22 – Sender’s Declaration. This form must be used on all First-Class Mail International package-size items, First-Class Package International Service items, Priority Mail International Small Flat Rate Boxes, M-bags, and certain Priority Mail Express International items.
This API is part of the USPS Web Tools API library which provides access to USPS data free of charge.
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