Fuel Station

A filling station sells by the meter, not by the receipt.

• Setup: grades (Petrol, Diesel, Kerosene) as products sold by the litre; prices from a time, with history (shifts opened before keep their price); pumps, nozzles and tanks.
• Today: open a shift for an attendant on a set of nozzles with the opening meters; close it with the closing meters; litres pumped back for testing; the sale posts itself (stock, books, deyn) at the price in force.
• Sell (the attendant's till at the pump): tap the nozzle, type the shillings (or the litres), tap Cash, M-Pesa or another wallet, or Card, and Sell & print receipt — the customer gets a receipt and the sale is in the books at once. The shift's total by cash, wallet and card stays on the right. With no internet it keeps selling: the receipt prints from the phone and the sale is sent when the signal returns.
• Cash-up: cash, mobile money and credit vouchers (a fleet's lorry filled on account, signed for by the driver) against the meters; what was sold at the pump with a receipt is counted first, and the cash expected includes the receipted cash; the shortfall is the attendant's.
• Tanks and deliveries: tanker deliveries received into the tank; the daily dip compared with the book (opening, plus deliveries, less the meters) shows the loss.
• Credit customers with statements, and the shop's till for lubricants and gas.