100% ends up added to the gross receipts.
Remember the patrons pre-pay for the pizza.
No where did it mention his matching the donations or donating the fund to a shelter.
All he need do is have +pre-pay and - pre-pay added to the pos and the accounting is cake
As far as I understand customers give cash $1, $2 etc...<To pay for future pizza> and the cash value is kept on the stick on. You make 5 of them disappear per day that is around 2 grand for the owner.