How to calculate gst for selling software keys, file hosting

Master (Freeelancer) (48 Points)

17 May 2018  

I am running a website where i sell software license keys, file hosting premium accounts and gift card, so how should i apply GST charges while selling these and how to file GST.

Suppose if i buy license from Software Company/ FileHosting Company or Gift Cards at Rs.1000 and sell at Rs1300/-, so GST should be applied on Rs.1300/- or only Rs.300/- as its my profit?

Please help me briefly, i am totally confused.