Script Variable Update Failing via Event Stream Webhook
Running Genesys Cloud 2024-02. Built an Express middleware to catch agent:script:step:entered events via Event Streams. The goal is to push dynamic data into script variables based on external DB lookups.
The webhook fires fine. JWT validation passes. The issue hits when hitting PATCH /api/v2/floors/scripting/scripts/{scriptId}/variables.
const payload = {
values: [
{ name: 'cust_tier', value: 'GOLD' }
]
};
// ... fetch response
console.log(res.status, res.body);
Console dumps a 400 with invalid_argument. The error message says variable 'cust_tier' not found in script definition.
Thing is, the variable exists. Checked the UI and the script JSON. It’s a text field, scope set to conversation.
Logs show the event timestamp matches the step entry. Maybe there’s a race condition where the script context isn’t fully initialized before the webhook fires? Or is the variable name case-sensitive in the API even though the UI shows it lowercase?
Script ID: a1b2c3d4-e5f6-7890-abcd-ef1234567890.
Tenant: acme-corp-gc.
The variable definition looks correct:
{
"name": "cust_tier",
"type": "text",
"scope": "conversation"
}
Response body: {"errors":[{"code":"invalid_argument","message":"variable 'cust_tier' not found in script definition"}]}
The agent:script:step:entered event payload doesn’t carry the write permissions needed to mutate script variables directly. You’re hitting a 400 because the Event Stream webhook acts as an external trigger, not an authenticated agent session. The API rejects the PATCH because the JWT scope lacks the specific script:variable write access, or more likely, you’re trying to patch a variable on a running session without the correct conversationId and participantId context.
You need to route this through the Conversations API instead of trying to patch the script definition. The agent:script:step:entered event gives you the conversationId. Use that to call the endpoint that updates variables for an active interaction.
Here is the corrected flow using the Node SDK. You’ll need the PureCloudPlatformClientV2 instance configured with a service account that has conversation:read and conversation:write scopes.
const platformClient = require('genesyscloud');
const client = platformClient.init({
clientId: process.env.GENESYS_CLIENT_ID,
clientSecret: process.env.GENESYS_CLIENT_SECRET,
basePath: 'https://api.mypurecloud.com'
});
// Inside your Express webhook handler
async function updateScriptVariable(eventPayload) {
const { conversationId, participantId, stepId } = eventPayload;
// 1. Fetch current variables to merge new data
const variables = await client.conversationsApi.getConversationParticipantsScriptVariables(conversationId, participantId);
// 2. Merge your external DB data into the existing variables
// Assuming you fetched externalData from your DB
const updatedVariables = {
...variables.body,
externalData: externalData
};
// 3. Patch the variables back
try {
await client.conversationsApi.putConversationParticipantsScriptVariables(
conversationId,
participantId,
updatedVariables
);
console.log('Variables updated successfully');
} catch (error) {
console.error('Failed to update variables:', error);
}
}
Make sure your service account has the script:view scope too, otherwise the GET request will fail. The variable name must match exactly what’s defined in the script editor. Case sensitivity matters here. If you’re still seeing 400s, check if the variable is marked as “Read Only” in the script configuration.
is spot on. You can’t patch script variables from a webhook because the auth context is wrong. You’ll need to route that event to an Azure Function to call the API with proper OAuth.