CXone Personal Connection API 400 Bad Request on outbound trigger

NICE CXone API & Integrations
1

I’m trying to bridge Genesys Cloud Data Actions with NICE CXone outbound campaigns. The goal is to trigger a specific CXone outbound call via the Personal Connection API when a specific event happens in GC. I have the integration set up, but the HTTP call from the Data Action keeps failing.

Here is the JSON body I’m sending to https://api.nicecxone.com/api/v2/outbound/personal/connection/calls:

{
 "to": "+15550199",
 "from": "+15550100",
 "campaignId": "abc-123-def",
 "contactId": "contact-xyz"
}

I’m using the CXone API key for authentication in the header. The response is a 400 Bad Request with this payload:

{
 "errors": [
 {
 "code": "INVALID_PARAMETER",
 "message": "Missing required field: callContext"
 }
 ]
}

The docs for Personal Connection are pretty sparse on the exact structure of callContext. I’ve tried passing an empty object {} and a string, but it keeps rejecting it. Is there a specific schema I need to follow for this field when triggering via API vs the UI? I just need to fire off the call and let CXone handle the rest.