It does not change the wage
The agreed wage stays where it is, so next month starts clean.
What it does
Record extra money as a bonus, not as a changed wage.
Extra money given at a festival should never turn into an argument about what the wage was.
You give ₹2,000 at Diwali. Next month he remembers a bigger salary, and you remember a gift.
The wage is the wage. The bonus is a separate line, with the date and the reason.
The agreed wage stays where it is, so next month starts clean.
On its own line, so anybody reading the slip can see what it was.
On his own phone, on the day you record it.
Yes, in what you paid. It is shown separately from the wage so both figures stay clear.
It is free, it works with no internet, and setting up your shop takes about three minutes.