The Postal Service has updated its Address Change Service (ACS) guides for mail and parcels, effective October 18, 2019.
Now available are these new ACS guides:
Traditional ACS Technical Guide — This document is a guide that provides technical information about Traditional ACS. Click to see
OneCode ACS Technical Guide — This guide provides technical references for OneCode ACS. Click to see
Traditional ACS with Shipper Paid Services Technical Guide — This guide provides technical information about Traditional ACS with shipper paid services. Click to see
Intelligent Mail Package Barcode (IMpb) ACS Technical Guide — This guide includes a solution overview, features, participation requirements, and service endorsement options. Click to see
ACS File Format Technical Guide — This document contains the technical guide for ACS file format. Click to see