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

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).

Please report any problems you're experiencing with the Merchant Returns API to Merchant.Returns.Support@usps.gov

Contact Information:

Important Updates

The "Heartbleed" bug hasn't affected Postal Service websites that require customers to provide usernames and passwords, according to USPS IT and the Corporate Information Security Office (CISO). To learn more information, click here.

Standard Mail DSCF Load Leveling Final Rule Published in the Federal Register

The Postal Service has released its Federal Register final rule revising the service standards for Standard Mail that is eligible for Destination Sectional Center Facility (DSCF) rates. These changes will allow a more balanced distribution of DSCF Standard Mail across delivery days. With its new rules, USPS is extending delivery expectation to four days for mail entered on Friday and Saturday. National Implementation began April 10, 2014.

January 2014 Price Change Fact Sheets

Getting Started with Full-Service Intelligent Mail

PostalOne! Contingency Plan

For mailers unable to submit electronic information, click here for the PostalOne! Contingency Plan.


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