Each one is a service that passes its tests and still fails in production. Pick one.
Daily totals are off by a few cents. The visible tests pass. Work out what production does that the tests do not.
A receipt's total is exactly the sum of the lines it shows, and that total is what the card is charged.
The daily report matches what the processor charged, to the cent.
Each line is its price times quantity, less the discount, rounded to the nearest cent. Half a cent rounds up.