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Merchant Returns API

The Returns APIs allow merchants that have signed up for the Scan Based Payment service access to the online serices of the Unites States Postal Service (USPS).

Who is the Merchant Returns API for?

Software Developer


The API allows merchants to directly offer merchant-funded USPS return labels from their own websites. The Domestic Returns API offers labels of three different sizes (4x4, 4x6, 3x6) in either PDF or TIF formats for customer convenience. The International Returns API allows merchants to accept returns originating outside of the United States by integrating its online services with another country's postal service. The return labels also each have an Intelligent Mail Package Barcode (IMpb) that can be tracked on

Important Note: In order to begin using the API, you must first become a registered user with the assistance of a USPS administrator (see contact information below).

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Related Products

Intelligent Mail® Package Barcode (IMpb)

IMpb provides piece-level data to enable the Postal Service to increase efficiency, add value to its package product line, and enhance its package tracking capabilities.


For more information on the Merchant Returns API, contact support at