How to get the user session on checkout while using chekout API

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I am creating the APP where i am opening the checkout the web view. The main issue is if user is logged in via login api then checkout web view is not showing the user is logged. 

I know the web view is refereeing the web session while i am developing the APP i am not able to get the session of web due to that it is asking for the login so is there any way in the checkout API where i can get the user session the webview of checkout ?