Linking multiple shopify account to react app

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I have created a react app for sales and I want to link their Shopify account with my app. If the user is logged in then he will be able to link his Shopify merchant account and to fetch its details similarly if it is user B then he can link and see his details. 

I have seen the documentation and the only thing in them is how to link your own personal Shopify account with react app.

Is there any API or method in which I can achieve it?