Direct Message the bot the cost and the paid amount. The bot does 3 things, it Direct Messages you your exact change, informs you that you did not pay more than the “item” costs, or asks you to change your formatting. The bots Twitter handle is @CashRegister_Sn. Message me on twitter at @amaroney92 or email email@example.com if you would like me to turn on the bot. I don’t keep the bot running 24/7.
This bot was made very quickly in about 3 days as a proof of concept.
Twitter Cash Register