How to use wonderpush in react-native

[TajSinghESGI]

Hi how to use wonderpush in order to subscribe the user and send him notifications ? I've tried to do just a : wonderpush.getDeviceId() but it says that :

TypeError: null is not an object (evaluating 'RNWonderpush.getDeviceId')

This error is located at:
    in Notifs (at SceneView.js:9)
    in SceneView (at DrawerView.tsx:183)
    in RCTView (at ResourceSavingScene.tsx:37)
    in RCTView (at ResourceSavingScene.tsx:26)
    in ResourceSavingScene (at DrawerView.tsx:175)
    in RCTView (at screens.native.js:101)
    in ScreenContainer (at DrawerView.tsx:164)
    in RCTView (at createAnimatedComponent.js:218)
    in AnimatedComponent (at Drawer.tsx:532)
    in RCTView (at createAnimatedComponent.js:218)
    in AnimatedComponent (at Drawer.tsx:528)
    in PanGestureHandler (at Drawer.tsx:518)
    in DrawerView (at DrawerView.tsx:251)
    in DrawerView (at createNavigator.js:80)
    in Navigator (at SceneView.js:9)
    in SceneView (at StackViewLayout.tsx:900)
    in RCTView (at createAnimatedComponent.js:151)
    in AnimatedComponent (at StackViewCard.tsx:106)
    in RCTView (at createAnimatedComponent.js:151)
    in AnimatedComponent (at screens.native.js:71)
    in Screen (at StackViewCard.tsx:93)
    in Card (at createPointerEventsContainer.tsx:95)
    in Container (at StackViewLayout.tsx:975)
    in RCTView (at screens.native.js:101)
    in ScreenContainer (at StackViewLayout.tsx:384)
    in RCTView (at createAnimatedComponent.js:151)
    in AnimatedComponent (at StackViewLayout.tsx:374)
    in PanGestureHandler (at StackViewLayout.tsx:367)
    in StackViewLayout (at withOrientation.js:30)
    in withOrientation (at StackView.tsx:104)
    in RCTView (at Transitioner.tsx:267)
    in Transitioner (at StackView.tsx:41)
    in StackView (at createNavigator.js:80)
    in Navigator (at createKeyboardAwareNavigator.js:12)
    in KeyboardAwareNavigator (at createAppContainer.js:430)
    in NavigationContainer (at App.js:8)
    in App (at renderApplication.js:40)
    in RCTView (at AppContainer.js:101)
    in RCTView (at AppContainer.js:119)
    in AppContainer (at renderApplication.js:39)

<global>
    index.js:30:33
constructor
    Notifs.js:25:20
renderRoot
    [native code]:0
runRootCallback
    [native code]:0
unstable_runWithPriority
    scheduler.development.js:643:23
callFunctionReturnFlushedQueue
    [native code]:0