How a day at the station is recorded, and what the owner sees at the end of it.
Stock is kept digitally and checked against the pump meters, so a shortfall shows up the same day instead of at the next delivery.
Every sale, expense, collection and credit is logged against the person who entered it, and cash counted at close is compared with what the day should have made.
Staff can record credit but not approve it. The owner approves, and the receivable is only closed when the payment is confirmed.
The real station records are behind a sign-in and an admin approval.