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Passwordless Universal login mobile device


I would like to use Passwordless Universal login for native apps and I feel like I am missing something.
We have a native app and a backend server.
when user login to auth0 we redirect him to our backend server. the backend server init the user on our system if it does not exists. and then should redirect him to his device.
As known android and Iphone has different schema uri.
How can my backend know for which URI it should redirect for the native apps? what am I missing?

Thanks David