hi,
you need to buy your license, then you will have your personal copy and your personal copy will have a direct http connection with the exchanges you wants to add.
Exchanges likes bot because they make them tons of fees.
I've directly worked (i men works with internal team/owner) with some exchanges like Poloniex, Cex.io. C-cex, yobit, hitbtc, the rock trading (and some more....)
They create API system with the intentions of bot interactions