The DNC abbreviation most likely refers to Delaware North Company. Delaware North is a Contract Management Company. As an example, below listed "DNC GRT AMR BALLPARKCINCINNATI" most likely refers to Great American Ball Park (Cincinnati Reds Stadium). I believe that the GE reference may refer to paybox.ge as a payment service. "paybox.ge is online payment web page, where you can make payments to more than 200 online merchants (mobile operators, bookmakers, utilities, penalties, banking services, parcels, etc.) 24 hours a day, via any internet-enabled device. I believe that "POS REFUND DNC GE WEST MEMPHIS" is a reference to Southland Gaming & Racing in South Memphis.
I am rather confident that this may be a good jumping off point for you. Here are a couple of links to head you in a bit of a direction.
https://www.delawarenorth.com/divisions https://www.allfreechips.com/casino-banks/41/paybox.html