Resources ACS™ File Format Technical Guide OneCode ACS® Technical Guide Intelligent Mail® Package Barcode (IMpb) ACS™ Technical Guide ACS™ Product Information Guide: Publication 8 Traditional ACS™ Technical Guide Traditional ACS™ with Shipper Paid Services Technical Guide SingleSource ACS™ Technical Guide Secure Destruction Technical Guide ACS™ Electronic Product Fulfillment (EPF) Fulfillment File Access Appendix A: Ancillary Service Type Identifier (STID) Details Appendix B: ACS™ Frequently Asked Questions Appendix C: ACS™ Product Code Information and Details Appendix D: Glossary of ACS™ Acronyms and Terminology Appendix E: ACS™ File Format Change History