How to Generate Access Token from Grant token and then from Refresh token

Hi this is my first ever first here!

I am working on PHP SDK, right now i have created self token from developer console, now when i am trying to add generate access token from the below code i get url not correct,

here is the code

https://accounts.zoho.com/oauth/v2/token?code=mycode&redirect_uri=urk&client_id=code&client_secret=code&grant_type=authorization_code

So i am stuck here!