Web Messaging SDK startChat() CRM ID not persisting to Genesys Cloud

NICE CXone API & Integrations
1

Struggling to understand why the CRM customer ID isn’t sticking when i init the chat session via the Web Messaging SDK.

i’m running a PowerShell script to handle some pre-chat validation and then trigger the widget launch. the goal is to push the customerId into the guest profile so it shows up in the agent’s view immediately. i’ve got the token sorted, that part works fine. the issue is the data mapping.

here’s the repro:

  1. fetch an OAuth token using Invoke-RestMethod against the /v2/oauth/token endpoint. standard client credentials flow.
  2. initialize the GenesysCloudWebMessaging object with the region au-01 and the app ID.
  3. call startChat() with a payload containing the attributes block:
{
"attributes": {
"crmId": "CUST-998877",
"source": "ps-script"
}
}
  1. the chat connects, no errors in the console. status is connected.

but when i check the conversation details via the /api/v2/conversations endpoint, the attributes object is empty. the crmId is gone. i’ve tried putting it in the data field instead, same result. i’ve also tried using the setAttributes method after the chat is already live, and that actually works. the ID appears. so the API is accepting the data, but startChat() seems to be stripping it or ignoring it before the session fully initializes.

is there a specific format for the attributes in the startChat call that i’m missing? the docs are pretty vague on the exact structure for the initial payload. i feel like i’m doing something stupid with the JSON encoding in PowerShell. ConvertTo-Json usually handles it, but maybe the nesting is off?

anyone else hit this wall with the JS SDK? i’m on version 1.4.2 of the widget.

2

Have you tried checking the startChat payload structure? i’ve seen this exact issue in Laravel apps where the data gets nested incorrectly.

Cause:
the Web Messaging SDK expects a flat key-value map for startChat. if you’re passing an object like { customerId: '123' } directly into the config, the SDK might not merge it into the guest profile correctly. also, make sure you’re not overwriting the guest object entirely. the SDK merges properties, so if your structure is off, it drops the custom attributes.

Solution:
pass the CRM ID as a direct property on the guest object during initialization. here’s how i handle it in PHP before sending to the frontend:

// prepare the payload for the frontend widget
$widgetConfig = [
 'organizationId' => env('GENESYS_ORG_ID'),
 'deploymentId' => env('GENESYS_DEPLOYMENT_ID'),
 'guest' => [
 'displayName' => 'John Doe',
 'email' => '[email protected]',
 'attributes' => [
 'customerId' => 'CRM-998877', // this is what agents see
 'loyaltyTier' => 'gold'
 ]
 ]
];

then in JS:

webMessaging.startChat({
 guest: {
 displayName: 'John Doe',
 email: '[email protected]',
 attributes: {
 customerId: 'CRM-998877'
 }
 }
});

double-check your Architect routing too. sometimes the data arrives but the data action mapping is looking for data.customerId instead of data.attributes.customerId. i usually add a debug log in the data action to see exactly what hits the server. if it’s missing there, the SDK didn’t send it right. if it’s there but the agent doesn’t see it, your agent desktop widget config is probably not displaying that specific attribute.

also, cache your OAuth tokens. hitting the token endpoint on every chat start is a bad idea and can cause race conditions if the token expires mid-session. use Guzzle to fetch once, store in Redis, and reuse.