Passing CRM ID in Web Messaging SDK startChat() payload

NICE CXone API & Integrations
1

Trying to inject a CRM customer ID into the Genesys Cloud Web Messaging SDK startChat() method. The docs show a customAttributes field in the configuration, but it’s not clear if that persists to the conversation metadata or just the widget state. Here’s the snippet:

const chatConfig = {
 queueId: 'abc-123',
 customAttributes: {
 crmId: 'CUST-999'
 }
};

await sdk.startChat(chatConfig);

The chat initiates fine, but the attribute doesn’t show up in the /api/v2/conversations/messaging payload. Is there a specific key format required for external CRM data, or does this need a separate PATCH call after the conversation is created?