FSAirlines

I want to be able to integrate the booking page on my site, so that my pilots can directly book the flight or the charter flight
I do not know the code that must be put when I put the login code, it works but when you want to book it goes directly to the login does it need an api key ??? who can explain it to me. I would also like people to be able to register directly with my company through my website. Thank you