How to integrate unity3d AR app inside React native app - react-native

As I mentioned, I need to insert a unity project into an app in react native.
I saw that there is this component that should help me do this (react native unity view).
I saw that there is a way to intercept messages sent by unity. (onUnityMessage method), but how do I send some data from react native app to unity? (example: auth token).
I must be able to send the token to unity so that it can be used by unity app.
How can I do this?
thank you in advance!

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I believe this https://github.com/joeferraro/react-native-cookies should provide you what you want.I have used this to clear cookies successfully.