It shows the working, not just the total
Each line is there, so the number is not something to be taken on trust.
What it does
One screen with the last figure, and how it was reached.
The last day is when a wage argument does the most damage, because after it nobody is around to fix it.
Two people with two different figures, on the day one of them is walking out.
Days worked, wage, advances still to come off, bonus, and the figure at the bottom. Both of you looking at the same screen.
Each line is there, so the number is not something to be taken on trust.
Anything still to come off is on the same screen, not remembered afterwards.
Make a payslip for that last month and send it to him.
It is your own record of the last payment. It is not a legal certificate, and it does not decide what the law requires you to pay.
Yes, on his own phone, with the same lines.
It is free, it works with no internet, and setting up your shop takes about three minutes.