React native Redirect authentication api - wordpress

As i am new to react native stuck at one point.
I am developing an app in which i am using wordpress as a backend to store the new users data.
To Create a new user i need authentication as i am using wp rest api plugin to create user.
For authentication i have used Oauth Server plugin in wordpress admin.
Now issue is as per the Oauth documentation i need to get the authentication code in my app.
So want to know how to redirect_uri to our react-native app so that i can get authorization code in app?

To get authorization code in react-native app, You need to set the custom Url scheme.
twitter has well documented guide to create it.
https://dev.twitter.com/cards/mobile/url-schemes
After creating the Url scheme. You need to set the redirect_uri as explained here in wp-oauth server's docs Step 2 and replace the created custom url of your app in redirect_uri.
This will redirect you to your app when oauth server's callback with the access token that you can use in your react-native application.

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I have a firebase project set up where I am only using the firebase auth features. I have a react app that uses the firebase client-side javascript SDK for authentication and a custom backend + database that does not use any firebase features.
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However, if I now want to set up a custom auth domain, what I've gathered from other answers is that I need to:
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Much of the documentation online is talking about using firebase hosting or other firebase black magic which I do not want to use.
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We are working on an application that uses firebase for authentication purposes. We implemented the authentication mechanism in our angular application and everything works fine. what we want now is to add custom claims to the JWT tokens generated once the user is authenticated. We know about the Admin SDK here:
https://firebase.google.com/docs/auth/admin/custom-claims
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