Prologue: My close friend works as the manager in a bar, the owner of the bar had regulation to gave a bonus for each band and employee to trade $150 for whatever liquor they want. Right now the system on how to handle the limitation was by words, mouth to mouth. My friend in the management, she had a trouble for keeping this regulation strict as in not exceed the limit they spend.
So, I want to make a game card system like in the arcade, for the "point of sales software"limited to the swiping log, track the remaining balance, subtract or add balance to the card manually and automatically, import the value to Excel for easier employee salary management. And for the "card reader" it able to connect with the software, read how much the balance, display the balance, deduct the balance with the ID of the card, and able to split bill with the credit and cash.
Please, help me show the path on what I should learn and I'm grateful.