How to get the ACCESS token

i have created a test app on the api, now what how to gt the access token? and how to send and get the JSON data ? please i am having trouble with that.

@dpk_singh, you can use the developer’s console for testing apis and creating access tokens for testing. You will find the link to console on test app details page.
Generating access tokens and using APIs on developers console is very easy and few clicks thing. You can follow the steps mentioned here:

Once you have completed the testing, you can implement the same in you application. For that you should read about oauth 2.0 first. Use this link:

You will have to implement the logic of getting access tokens in your application. Once that is done, you can call APIs from your app.