Verify users with a missed callno SMS OTP required.

import 'package:shernova_core/shernova_core.dart';
import 'shernova_config.dart';

await Shernova.init(shernovaConfig);

final session = await Shernova.verify(phoneNumber: '+201012345678');
await for (final update in Shernova.watch(session.sessionId)) {
  if (update.status == 'waiting' && update.gatewayPhoneNumber != null) {
    // gateway number assigned (null while 'queued' - no line free yet)
  }
  if (update.status == 'verified') {
    // User confirmed - proceed with signup
    break;
  }
}