I understand that you need to eat too. I used to do shift work, and it sucks. 30 minutes for lunch doesn’t go very far.
But next time you send one person to pick up 13 different orders, can you please put it all on one ticket and pay cash? Please do not write your order on a sticky note and put the sticky note on your debit card, and make the poor “gopher” order each order separately and pay each bill separately. There must be a better way to order.