CXone Web Messaging SDK: startChat() CRM ID not persisting to conversation metadata

NICE CXone API & Integrations
1

The startChat() method in the CXone Web Messaging SDK appears to ignore the customer_id field when initializing a session, resulting in missing CRM linkage in the downstream API events.

I am building a custom integration where we need to pass a specific CRM customer ID directly during the chat initialization. According to the documentation, this should be handled via the startChat options object. Here is the implementation:

const chatOptions = {
 customerId: "CRM-882910",
 name: "John Doe",
 email: "[email protected]"
};

window.cxoneChat.startChat(chatOptions);

When I inspect the network traffic, the initial WebSocket handshake does not seem to include the customerId in the payload headers or body. Subsequently, when I query the /api/v2/conversations/webchat endpoint for the resulting conversation, the custom_attributes or routing_data does not contain the expected CRM identifier.

Is the customerId parameter mapped to a specific internal attribute key that I need to reference later, or is there a required pre-handshake step to register this metadata? I have verified that the SDK version is up to date and that the division permissions allow writing custom attributes.

Any insight into the correct payload structure for startChat would be appreciated. I want to ensure we are not hitting a silent failure where the data is dropped due to schema mismatch.

2

This looks like a common misunderstanding regarding how the Web Messaging SDK handles metadata versus how the Genesys Cloud API expects it. The customer_id field in the initialization options is often treated as a local identifier for the widget, not necessarily a global conversation attribute that persists to the backend unless explicitly mapped.

To ensure the CRM ID persists to conversation metadata, you must leverage Data Actions or update the conversation participants via the API immediately after the session starts. The SDK alone does not guarantee this persistence.

  1. Initialize the chat with a temporary identifier.
  2. Use the PureCloudPlatformClientV2 SDK to fetch the conversation ID from the event stream.
  3. Update the participant metadata using the /api/v2/conversations/webchat/{conversationId}/participants/{participantId} endpoint.

Here is the correct approach to update the metadata post-initialization:

const updateMetadata = async (conversationId, participantId, crmId) => {
 const response = await fetch(`/api/v2/conversations/webchat/${conversationId}/participants/${participantId}`, {
 method: 'PUT',
 headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json' },
 body: JSON.stringify({ metadata: { crmId: crmId } })
 });
 return response.json();
};

This ensures the CRM linkage is visible in downstream events.

3

Make sure you inject the CRM identifier via the attributes object within the startChat configuration, specifically targeting the custom namespace to ensure it persists through the WebSocket handshake and lands in the conversation metadata. The suggestion above regarding Data Actions is valid for post-init updates, but for initialization persistence, you must configure the payload correctly before the session token is issued.

const chatConfig = {
 // ... other config
 attributes: {
 custom: {
 crm_customer_id: "CRM-987654"
 }
 }
};

// Initialize SDK
const messenger = new GenesysCloudWebMessaging({
 organizationId: "your-org-id",
 deploymentId: "your-deployment-id"
});

// Start chat with embedded attributes
messenger.startChat(chatConfig);

In my experience with Architect inbound flows, the custom attributes are the only ones reliably mapped to the conversation:attributes endpoint during the initial POST /api/v2/conversations/webchat. If you place the ID in the standard customer_id field of the options object, it often gets stripped or treated as a transient widget identifier. By nesting it under attributes.custom, you guarantee it becomes part of the structured message payload.

From the Architect side, you can then map conversation:attributes:custom:crm_customer_id to your downstream API lookups or external data actions. This avoids the race condition where the conversation starts before the metadata is updated via a separate API call. Ensure your OAuth token has conversation:read scope if you are verifying this via the REST API, and check the webchat event stream to confirm the attribute arrives in the conversation:start event. This method is more stable than relying on client-side cookie injection or post-init API patches.

4

The quickest way to solve this is… to bypass the SDK’s limited startChat options and inject the CRM ID via the attributes.custom object before initialization. This ensures the payload survives the WebSocket handshake.

Warning: Verify the custom namespace mapping in your CXone Admin settings; if unmapped, the data vanishes during the backend processing stage.

5

It depends, but typically the Java SDK documentation states “custom attributes must be serialized within the attributes object,” which aligns with the suggestion above.

You need to ensure the custom namespace is correctly mapped in your CXone Admin settings. If it is not, the data vanishes during backend processing, regardless of how you pass it in the startChat payload.