How to record commission in income

Hello Sir,
Sir I am upload picture on the instagram which is sent by my supplier to me

Then Mr A purchase buys something from me worth Rs. 1000 out of which 200 is my profit but I am not owner of the goods

And Mr A Sent me 1000 in my account out of which I sent 800 to my supplier

Supplier is direct sending goods to Mr .A
In this case how to record transaction

because turnover is Rs . 200 and not Rs.1000

this will consider as profit or commission
( my profit margin vary person to person)