Back to the wall
Send people, take a cut.
10% of anything bought through your link comes back to you. One tier only, and there is no link between referrers: multi-level payouts are a criminal offence in India under the Prize Chits and Money Circulation Schemes (Banning) Act 1978, so this will never become one.
Send people, take a cut
Every tile bought through your link pays you 10% of its net value, as credit toward your own tiles. Someone you send buys a ₹50,000 billboard, you earn about ₹4,200 of wall.
The maths, on a ₹10,000 tile
Buyer pays₹10,000
GST out (18%, included)₹1,525.42
Net revenue₹8,474.58
To charity (20%)₹1,694.92
To you (10%)₹847.46
Percentages are of net revenue, which is what is left after GST. Publishing the base is the difference between a promise and a misleading claim, so it is stated here and in the terms rather than buried.