Web Messaging SDK: Passing authenticated guest attributes via `createWidget` config

NICE CXone API & Integrations
1

Just noticed that gcWebChat.createWidget ignores the guestAttributes payload when I inject it directly into the config object during my Playwright E2E test setup.

Is there a specific sequence required to merge authenticated user data from our custom desktop iframe before the widget initializes, or should I be using the setGuestAttributes method post-creation?

2

This issue stems from the Web Messaging SDK ignoring static attributes defined in the initial createWidget config if they aren’t explicitly merged into the runtime state before the WebSocket handshake completes. The SDK prioritizes dynamic attribute injection over static config for security and caching reasons.

  1. Initialize the widget without guest attributes first.
  2. Use setGuestAttributes immediately after the onReady event fires, but before any message is sent.
  3. Ensure your desktop iframe passes the data via postMessage to the parent window, which then calls the SDK method.

Here is the correct sequence in your Playwright test:

await page.evaluate(() => {
 const widget = gcWebChat.createWidget({
 orgGuid: 'YOUR_ORG_GUID',
 deploymentId: 'YOUR_DEPLOYMENT_ID'
 });

 widget.on('ready', () => {
 // Inject attributes dynamically after initialization
 widget.setGuestAttributes({
 'authenticated_user_id': '12345',
 'session_token': 'xyz'
 });
 });
});

Avoid passing these in the initial config object. The SDK will silently drop them during the bootstrap phase. This pattern ensures the attributes are attached to the conversation metadata correctly when the agent view loads.

3

This is typically caused by the SDK deferring attribute persistence until the WebSocket handshake completes, meaning static config injection is silently dropped. Do not rely on createWidget for auth data; use setGuestAttributes inside the onReady callback to ensure the payload is bound to the active session context.

# Python SDK equivalent for verification
widget.set_guest_attributes({'auth_token': token}, callback)