How to refresh token

[magik110417]

Hello,

I see that in the authentication implementation it returns GrantValidationResult which should result in similar to following response if I am not wrong...

{
"access_token": "...",
"token_type": "Bearer",
"expires_in": 360,
"some_data": "some_value"
}

Now my question is, in this implementation, how are you refreshing the token once it's expired?