Hello Yevgen,
Thanks for your suggestion. With your suggestion we have tested via postman and we have received response via SMP, after some modification in SMP. According we have to change metadata url in our code.
Now the initial page got loaded in our mobile app. All other functionality are working fine now except "Login". While clicking the login button the login.xml got loaded, but giving the userID and password its giving the below error in device debugging.
Thanks & Regards,
Souvik Saha