Modify Laravel Project: Passport API calls redirecting to login page. Resolve existing API calls -- 2

Passport API calls redirecting to login page. Resolve existing API calls. API call uses laravel passport and oauth-public.key. stopped working due to some changes on the code. Some API calls needs to return json response and not redirect to login html. We need to be able to test api's using postman.
Please Note that this is an existing code base and requires a laravel expert. Its built on laravel 5.3.