Webhook Payloads

Decibyl executes webhook nodes asynchronously after a workflow run completes. You configure the target URL, HTTP method, headers, and payload template directly in the workflow definition.

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How webhooks work

1. A call completes (or a run finishes)
2. Decibyl executes any webhook nodes in the workflow asynchronously
3. The payload template is rendered with the run’s context and sent as a JSON POST (or your configured method) to your endpoint
4. Non-200 responses are logged but do not block or retry by default (configure retry_config to change this)

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Payload context variables

The following variables are available in your payload_template using double-brace syntax (e.g. {{workflow_run_id}}):

Variable	Type	Description
workflow_run_id	integer	ID of the completed run
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
annotations	object	QA analysis results (if a qa node is configured)
recording_url	string | null	Public download URL for the call recording
transcript_url	string | null	Public download URL for the call transcript

Example payload template

{
  "run_id": "{{workflow_run_id}}",
  "customer": "{{initial_context.customer_name}}",
  "outcome": "{{gathered_context.resolution}}",
  "recording": "{{recording_url}}"
}

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Authentication

Webhook requests support the following authentication methods, configured via a stored credential:

Type	Description
NONE	No authentication
API_KEY	Sends the key in a custom header (e.g. X-API-Key)
BEARER_TOKEN	Sends Authorization: Bearer <token>
BASIC_AUTH	HTTP Basic authentication (username + password)
CUSTOM_HEADER	Any custom header key-value pair

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Receiving webhooks

Your endpoint should:

• Accept POST requests with Content-Type: application/json
• Respond with a 2xx status code promptly (within 30 seconds)
• Handle duplicate deliveries idempotently (retries may deliver the same payload more than once)

Minimal example receiver (Python)

from fastapi import FastAPI, Request

app = FastAPI()

@app.post("/webhook/decibyl")
async def handle_decibyl_webhook(request: Request):
    payload = await request.json()
    run_id = payload.get("run_id")
    outcome = payload.get("outcome")
    # process the call result...
    return {"status": "ok"}

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Webhook node in a workflow definition

See Workflow Definition Schema for the full configuration reference.

{
  "id": "webhook-1",
  "type": "webhook",
  "position": { "x": 600, "y": 0 },
  "data": {
    "name": "Notify CRM",
    "enabled": true,
    "http_method": "POST",
    "endpoint_url": "https://your-service.com/webhook/decibyl",
    "payload_template": {
      "run_id": "{{workflow_run_id}}",
      "customer": "{{initial_context.customer_name}}",
      "outcome": "{{gathered_context.resolution}}"
    }
  }
}