Two things that go wrong quietly: points that never expire correctly, and a till that never quite balances. Both were rebuilt this week.
Points and Credit That Expire Correctly
Points and credit are tracked in lots with their own expiry, and are consumed oldest first, so a balance and its expiry are both accurate.
A Real Close of Day
Cash drawer sessions open and close with a counted total, a withdrawal step and a close-of-day report you can print.
A Screen for the Customer
A paired customer-facing screen shows what is being rung up, so the customer sees the total as it is built.