Using Autosuggest API by mapmyindia

I'm sort of getting started with web-dev. I'm trying to build a web-app in which I'm trying to use the autosuggest API by mapmyindia. I signed up and got the API key as well as authentication token. Now i can't figure out how to use the autosuggest API by reading the documentation. I tried referring to the example provided in the source code but the source code is written in PHP and I'm using javascript to build the app. Also, I don't know PHP. It would be great if someone can suggest a way to use the API.