ACS is the legacy cargo processing system that is transitioning to the Automated Commercial Environment (ACE). ACE is being developed as the primary, modernized system through which the U.S. Government will track, control and process all imported and exported goods.

As CBP processing is transitioned to ACE, the technical requirements for transmitting data to ACE will be posted on CBP.gov under the ACE webpage. The documentation for any functionality remaining in ACS will be posted here until that functionality transitions to ACE.