Controlling ESP8266 using IFTTT maker webhook

I'm using IFTTT to trigger 1 light that is connected to GPIO 2 on the esp8266.

basicallly when ask google assistant to "turn on my light", it will send a thing to the esp8266 to triggger the light.

But i'm now really confused why the maker webhook stuff like GET, POST, PUT and all that.

Can someone help with this?