Body request and response for Playoff authenticaton

Authenticate.md

Make a POST request to:

https://playoffgamification.io/auth/token

With a body like this:

{
	"client_id": "<YOUR_CLIENT_ID>",
    "client_secret": "<YOUR_CLIENT_SECRET>",
    "grant_type": "client_credentials"
}

Following an example of a response:

{
    "access_token": "<YOUR_ACCESS_TOKEN>",
    "expires_in": 86400,
    "token_type": "Bearer"
}