Thinking outside the box here. If you are like me you don't count change, we round to the $. If this is how you do it you could $100.00 starting cash and 50 starting tokens So enter it as $100.50. Use the cents to track your tokens.
Another thing you could try it Square loyalty program. Set it up so that they buy a token they get a token "reward". Think of it as a digital punch card if you will. All this will then be tracked and they can redeem at any time all saved under there phone number.
