The systems and methods described herein relate generally to the integration of a shipping label with a customs form to provide a single label having postage, addressing, customs, and other information for international shipping, and in particular, to managing landed cost and harmonization for international packages. In one embodiment, managing the landed cost and harmonization may comprise generating a unique self-validating postage indicium or mark in response to a request that includes a description of contents for a package onto which an international shipping label is to be placed and a destination country where the package is to be delivered. As such, the unique self-validating postage indicium or mark may indicate that landed costs for delivering the package to the destination country have been pre-paid, wherein the unique self-validating postage indicium or mark and a customs declaration form may be printed on the international shipping label.
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