diff --git a/api/tasks/run_integrations.py b/api/tasks/run_integrations.py
index d73a39b..f60829c 100644
--- a/api/tasks/run_integrations.py
+++ b/api/tasks/run_integrations.py
@@ -1,6 +1,7 @@
 """Execute integrations (QA analysis, webhooks) after workflow run completion."""
 
 import random
+from datetime import UTC, datetime
 from typing import Any, Dict, Optional
 
 import httpx
@@ -316,6 +317,8 @@ def _build_render_context(
         "workflow_run_name": workflow_run.name,
         "workflow_id": workflow_run.workflow_id,
         "workflow_name": workflow_run.workflow.name if workflow_run.workflow else None,
+        "campaign_id": workflow_run.campaign_id,
+        "call_time": (workflow_run.created_at or datetime.now(UTC)).isoformat(),
         # Nested contexts
         "initial_context": workflow_run.initial_context or {},
         "gathered_context": workflow_run.gathered_context or {},
diff --git a/docs/developer/webhooks.mdx b/docs/developer/webhooks.mdx
index 81dff12..9988f72 100644
--- a/docs/developer/webhooks.mdx
+++ b/docs/developer/webhooks.mdx
@@ -26,6 +26,8 @@ The following variables are available in your `payload_template` using double-br
 | `workflow_run_name` | string | Name of the run |
 | `workflow_id` | integer | ID of the workflow |
 | `workflow_name` | string | Name of the workflow |
+| `campaign_id` | integer \| null | ID of the campaign this run belongs to (null for ad-hoc runs) |
+| `call_time` | string | ISO-8601 UTC timestamp of when the run was created |
 | `initial_context` | object | Context passed when the call was initiated |
 | `gathered_context` | object | Data extracted during the call by agent nodes |
 | `cost_info` | object | Call cost breakdown |
diff --git a/docs/voice-agent/webhook.mdx b/docs/voice-agent/webhook.mdx
index 511ac5c..5d3cb32 100644
--- a/docs/voice-agent/webhook.mdx
+++ b/docs/voice-agent/webhook.mdx
@@ -26,12 +26,16 @@ The payload can contain a valid JSON, and you can reference variables while cons
 - `{{workflow_run_id}}` Unique ID of the Agent run
 - `{{workflow_id}}` ID of the Agent
 - `{{workflow_name}}` Name of the workflow
+- `{{campaign_id}}` ID of the campaign this run belongs to (empty for ad-hoc runs)
+- `{{call_time}}` ISO-8601 UTC timestamp of when the call was initiated
 - `{{initial_context.*}}` [Initial context variables](/core-concepts/context-and-variables#initial_context)
 - `{{gathered_context.*}}` [Extracted variables](/core-concepts/context-and-variables#gathered_context)
 - `{{cost_info.call_duration_seconds}}` Call duration
 - `{{recording_url}}` Call recording URL
 - `{{transcript_url}}` Transcript URL
 
+For the full list of available variables, authentication options, and receiver examples, see the [Webhook Payloads developer reference](/developer/webhooks).
+
 An example of the payload is given below
 
 ```