Release Notes
07/30/2025
User Guides
07/30/2025
Domestic Merchant Returns API: User Guide

This user guide provides examples of XML transactions to the USPS Merchant Returns web service and guidance for installation.

Data Files
07/28/2025
Labeling List Changes Effective September 1, 2025

Effective September 1, 2025, the Postal Service™ will revise Labeling List(s) L007, L012, L051, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the September 1, 2025, effective date through October 31, 2025, expiration date. The changes will be published in the Postal Bulletin, Issue #22682.