Major chains predominantly run on Toshiba SurePOS 4960. That 4-digit number should give you a clue. It is, of course, a spinoff of an IBM monstrosity originatin

Major chains predominantly run on Toshiba SurePOS 4960. That 4-digit number should give you a clue. It is, of course, a spinoff of an IBM monstrosity originating in 1980s. This thing is programmed in REXX and Java. Many files end in .286 Although there are possibilities for API integrations, users usually use the ssh interface into the controller system. It would take significant effort to add manufacturer coupon validation logic. By encoding self-contained data, coupons violate the first principle of data security - never trust the input. Source: I service 4960 controllers for major chains. My first encounter having to edit REXX files using native tools was very interesting.