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USPS Customs Forms API

The U.S. Postal Service provides a suite of USPS Web Tools that can be used to validate or find mailing addresses, track and confirm mail delivery, calculate shipping rates, and create domestic or international shipping labels. This set of Customs Forms APIs are used both by the USPS to approve mail that is leaving the country, and by authorities in countries that require the forms to approve mail for delivery within their jurisdictions.