oAuth 2.0 Playground

I am trying to get the steps count using https://developers.google.com/oauthplayground/

I have Exchange authorization code for tokens and request to API GET

https://www.googleapis.com/fitness/v1/users/me/dataSources/derived:com.google.step_count.delta:com.google.android.gms:estimated_steps

in my mobile googleFit APP it's showing the it have been connected to my Project.

The Json response I am getting :

Content-type: application/json; charset=UTF-8
{
  "dataType": {
    "field": [
      {
        "name": "steps", 
        "format": "integer"
      }
    ], 
    "name": "com.google.step_count.delta"
  }, 
  "application": {
    "packageName": "com.google.android.gms"
  }, 
  "dataStreamId": "derived:com.google.step_count.delta:com.google.android.gms:estimated_steps", 
  "type": "derived", 
  "dataStreamName": "estimated_steps"
}

but I didn't get the steps count values.

Here is the link that you can check for integrating google fit to your app

1) How to get step count from Google Fit REST API like Google Fit app?

2) https://plus.google.com/+DavidSchmidt/posts/TJjRTefojC6