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This changelog provides granular, real-time updates as changes are released. For a monthly summary of platform changes, see the Synthflow product changelog on our feedback portal.

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February 4, 2026

Collected Variables (Slots) now available in Post-call Webhooks and Call APIs

The collected_variables field is now included in post-call webhook payloads and call API responses. This field contains collected variables (slots) from your conversation flows, allowing you to access user-provided information programmatically.

Example Response:

1{
2  "collected_variables": {
3      "user_name": {
4        "value": "Julian",
5        "collected": true
6      },
7      "appointment_date": {
8        "value": "2025-10-28",
9        "collected": true
10      },
11      "user_email": {
12        "value": null,
13        "collected": false
14      }
15  }
16}

Updated endpoints:

EndpointTitle
GET /callsGet all calls
GET /calls/{call_id}Get a call

Post-call Webhook:

The collected_variables field is now included in the post-call webhook payload when configured.

Notes:

  • Each variable has a value (the collected data) and collected (boolean indicating successful collection)
  • The collected_variables field may be null if not available for a specific call
  • Variables are keyed by agent ID, then by variable name