Move from OneSignal without losing a subscriber

final config = ChumbaqConfig.builder(
  baseUrl: 'https://your-chumbaq-host',
  apiKey: '<project API key>',
  projectId: '<project id>',
).build();

await Chumbaq.instance.init(config);

// Who this is, once they log in.
await Chumbaq.instance.identify(
  IdentifyParams.builder().externalUserId('u_42').build(),
);

// Push: the SDK reports whatever the app hands it.
await ChumbaqPush.instance.init();

FirebaseMessaging.onMessage.listen(
  (message) => ChumbaqPush.instance.reportNotificationReceived(message.data),
);

import ChumbaqCore
import ChumbaqPush

let config = ChumbaqConfig.Builder(
    baseUrl: "https://your-chumbaq-host",
    apiKey: "<project API key>",
    projectId: "<project id>"
).build()

Chumbaq.shared.initialize(config: config)

// Who this is, once they log in.
try await Chumbaq.shared.identify(
    IdentifyParams.Builder().externalUserId("u_42").build()
)

// Push: APNs hands the app its device token.
ChumbaqPush.shared.initialize()
try await ChumbaqPush.shared.registerToken(deviceToken)   // Data or String

val config = ChumbaqConfig.Builder(
    baseUrl = "https://your-chumbaq-host",
    apiKey = "<project API key>",
    projectId = "<project id>",
).build()

Chumbaq.init(context, config)

// Who this is, once they log in.
Chumbaq.identify(IdentifyParams.Builder().externalUserId("u_42").build())

// Push: one call, and that is the whole integration.
ChumbaqPush.init(context)
ChumbaqPush.registerToken(fcmToken)   // or let the service pick it up

import Chumbaq from '@chumbaq/sdk';

const chumbaq = new Chumbaq({
  baseUrl: 'https://your-chumbaq-host',
  apiKey: '<project API key>',
  projectId: '<project id>',
});

await chumbaq.init();

// Who this is, once they log in.
await chumbaq.identify({
  externalUserId: 'u_42',
  deviceFingerprint: chumbaq.deviceFingerprint,
  platform: 'web',
});

// Push: the token from your own Firebase Messaging setup.
await chumbaq.registerPushToken({
  token: fcmToken,
  platform: 'web',
  provider: 'fcm',
});