User Identification

await client.identify({
  user_id: 'user_123',
  properties: {
    email: 'john@example.com',
    name: 'John Doe',
    plan: 'pro'
  },
  aliases: ['john@example.com', 'johndoe']
});

await client.events.create({
  channelName: 'activity',
  title: 'User Logged In',
  userId: 'john@example.com',  // ← Alias works!
});