Payload Harness — Async Callback (webhook)

The workflow JSON

Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →

{
  "name": "Payload Harness \u2014 Async Callback (Webhook)",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "test-agent-async-callback",
        "authentication": "headerAuth",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "a2b3c4d5-e6f7-4890-a123-456789abcdef",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        0,
        300
      ],
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "request-id",
              "name": "requestID",
              "type": "string",
              "value": "={{ ($json.body ?? $json).requestID }}"
            }
          ]
        },
        "options": {}
      },
      "id": "b3c4d5e6-f708-4901-b234-56789abcdef0",
      "name": "Extract Request ID",
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        260,
        180
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "={{ $env.PAYLOAD_PUBLIC_URL.replace(/\\/$/, '') + '/api/agent-runs/' + $json.requestID + '/events' }}",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ { \"requestID\": $json.requestID, \"status\": \"succeeded\", \"content\": \"Async result is ready\", \"n8nExecutionID\": $execution.id } }}",
        "options": {}
      },
      "id": "d5e6f708-1920-4123-d456-789abcdef012",
      "name": "Callback Payload",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        520,
        180
      ],
      "credentials": {
        "httpHeaderAuth": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ { \"status\": \"waiting\", \"content\": \"Processing asynchronously.\", \"n8nExecutionID\": $execution.id } }}",
        "options": {
          "responseHeaders": {
            "entries": [
              {
                "name": "Content-Type",
                "value": "application/json"
              }
            ]
          }
        }
      },
      "id": "e6f70819-2021-4234-e567-89abcdef0123",
      "name": "Respond Waiting",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [
        260,
        420
      ]
    }
  ],
  "connections": {
    "Webhook": {
      "main": [
        [
          {
            "node": "Extract Request ID",
            "type": "main",
            "index": 0
          },
          {
            "node": "Respond Waiting",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Extract Request ID": {
      "main": [
        [
          {
            "node": "Callback Payload",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "meta": {
    "templateCredsSetupCompleted": false
  },
  "tags": [
    {
      "name": "payload-harness"
    }
  ]
}

Credentials you'll need

Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.

• httpHeaderAuth

About this workflow

Payload Harness — Async Callback (Webhook). Uses httpRequest. Webhook trigger; 4 nodes.

Source: https://github.com/transformable-app/transformable-nodesui/blob/main/docs/n8n-workflows/test-agent-async-callback.json — original creator credit. Request a take-down →

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