Snapkit snapkit = new Snapkit();

snapkit.onAuthStateChanged.listen((SnapchatUser? user) {
    // Do something with the returned SnapchatUser or null here
});

class MyAppState extends State<MyApp> implements SnapchatAuthStateListener {

  snapkit.addAuthStateListener(this);

  @override
  void onLogin(SnapchatUser user) {
    // Do something with the returned SnapchatUser here
  }

  @override
  void onLogout() {
    // Do something on logout
  }

}

await snapkit.login();

// or

snapkit.login().then(user => {});

await snapkit.logout();

// or

snapkit.logout().then(() => {});

snapkit.verifyPhoneNumber('US', '1231234567')
  .then(isVerified {})
  .catchError((error, StackTrace stacktrace) {})

snapkit.share(SnapchatMediaType.NONE,
  sticker: SnapchatSticker?,
  caption: String?,
  attachmentUrl: String?
);

snapkit.share(SnapchatMediaType.PHOTO,
  image: ImageProvider,
  sticker: SnapchatSticker?,
  caption: String?,
  attachmentUrl: String?
);

snapkit.share(SnapchatMediaType.VIDEO,
  videoUrl: String,
  sticker: SnapchatSticker?,
  caption: String?,
  attachmentUrl: String?
);

new SnapchatSticker(
  image: ImageProvider
);