EBT, SNAP, FNS, TANF?

WHY ARE THESE IMPORTANT TO A RETAILERS AND GROCERS AND HOW DO I GET SET UP TO ACCEPT THEM? First Lets define the acronyms: EBT  - Electron Benefits Transfer SNAP - Supplemental Nutritional Assistance Program FNS - Food and Nutritional Services TANF - Temporary Aid to Needy Families In short; You...