Integrate an react native app with the contacts - java

I'm using react-native to make an multiplatform VOIP Dialer, and i'm facing difficuties to integrate my app with the default contacts list of the o.s (Android on the below example)
I didn't tried anything already because i dont know Java (For android) neither objective-c (For IOS). So i was hoping there's a module for that
Thanks in advance!

You can check this anwser Integrate my app with Contact , it shows how to do it with Java at an Android App.
Regards,

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EASYPAISA/JAZZCASH Payment Integration method (Android Studio)

Here is the issue and I am not able to find anything. I am not able to understand how can I do it because I have never done this before.
I want to integrate payment api(easypaisa/jazzcash) into my grocery app.
I don't find any help(neither youtube tutorial not anything else)
Can anyone help me out with this?
Thanks and Regards
Farah Jabeen
you can use webview in Android and use REST API for integration. OR
you can use Jazzcash mobile SDK for integration. API and Mobile SDK is available on jazzCash sandbox portal.

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The best option, and one I tend to leverage is use the simulator. I almost bench fly more than I fly outside.
I cannot think of another option of hand.

Firebase and Java offline storage

I know for sure that Firebase can work offline and store locally any changes you made to the database and whenever he get connection again upload the changes, when you're coding on android. This can be used in any Java aplication, or is it only in android? I've searched but find nothing about this. Thanks in advance!
firebaser here
Disk persistence is only available on iOS and Android. It is not available in the Java Admin SDK.
is it only in android? -- No, as you know Firebase is a technology that permits you to make mobile and web applications with no server-side programming so that development turns out to be quicker and easier.
You can use Firebase with-
Android
Unity
IOS
Web and more
Check this SO question.
Also, here is what I found.

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I am developing an iOS app using firebase, but I also want to create a java desktop application that accesses the same realtime database that the app uses. Is this possible to do? I feel as if this should be able to work because firebase works for Android apps which are written in Java. If this is possible, please give some details on how to go about doing this. Also, I am asking this in regards to the new and revamped firebase website that Google just recently announced.
Firebase has a server SDK for Java that should also work in a desktop Java application. The code is very similar to the Android Firebase code so you'll see familiar classes like DatabaseReference or ValueEventListener.

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