• Go to /main-domain and run npm install && npm run dev:watch
• Go to /subdomain-01 and run npm install && npm run dev:watch
• Go to /subdomain-02 and run npm install && npm run dev:watch
• Remember to mention auth.application.com, api.main.application.com, api.reseller.application.com pointed to 127.0.0.1 in your hosts file
• Visit auth.application.com:3000 in your browser and hit submit button
• Check the cookies in the browser
• Now goto other two servers i.e. api.reseller.application.com:3001 and api.main.application.com:3002 and check the cookies in developer console