n8n Webhook Response with Sticky Notes

The workflow JSON

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{
  "nodes": [
    {
      "id": "693e094e-0329-455d-9c42-ba398dd40955",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        -500,
        -160
      ],
      "parameters": {
        "path": "hotel-retell-template",
        "options": {
          "responseData": "={\"response\":\"Your booking is confirmed\"}"
        },
        "httpMethod": "POST"
      },
      "typeVersion": 2
    },
    {
      "id": "6172b8b6-4950-4b7f-a60c-ce782139f24c",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        300,
        -160
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 1.1
    },
    {
      "id": "6ebeaeb7-4ec5-4f5d-b8d5-3fd51ca8604c",
      "name": "[Replace me!] Set response",
      "type": "n8n-nodes-base.set",
      "position": [
        -100,
        -160
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "4159ec1f-4bd6-4473-90e5-a0c24e2bf302",
              "name": "response",
              "type": "string",
              "value": "Your booking has been confirmed!"
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "86c16dd4-0d9d-40bb-a495-02c1a2ac06f1",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -240,
        -340
      ],
      "parameters": {
        "color": 5,
        "width": 400,
        "height": 360,
        "content": "### \ud83e\udde0 Place your logic here!\nYour Agent logic goes here.\nYou can, for example, use an **AI Agent** to provide information back to your Retell agent and/or **make an action in a third party service**. For example: book an event, add a contact to a CRM, etc. \nSky is the limit! \ud83d\ude4c"
      },
      "typeVersion": 1
    },
    {
      "id": "f8be07ca-1d3f-46cb-b858-bb22b15efe0f",
      "name": "Sticky Note2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -560,
        -340
      ],
      "parameters": {
        "color": 5,
        "width": 220,
        "height": 360,
        "content": "### Retell Custom Function Webhook\nPOST Webhook received from Retell's Custom Function each time it is triggered by Retell's Voice Agent"
      },
      "typeVersion": 1
    },
    {
      "id": "94ec297f-aa00-4358-b1f9-834438548a19",
      "name": "Sticky Note3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        200,
        -340
      ],
      "parameters": {
        "color": 5,
        "width": 300,
        "height": 360,
        "content": "### Retell Custom Function Response\nResponse to the webhook that will be provided back to Retell's Voice Agent.\n\n**Modify the response accordingly** if you want anything else than the first incoming input being sent back"
      },
      "typeVersion": 1
    },
    {
      "id": "baff741b-8cd3-4f7d-a56f-5029e1babc26",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -1500,
        -700
      ],
      "parameters": {
        "color": 7,
        "width": 880,
        "height": 1220,
        "content": "## Connect Retell Voice Agents to Custom Functions\n\n## Overview\n- This workflow allows you to **trigger custom logic in n8n directly from Retell's Voice Agent** using [Custom Functions](https://docs.retellai.com/build/conversation-flow/custom-function#custom-function).\n- It captures a POST webhook from Retell every time a Voice Agent reaches a Custom Function node.\n- You can plug in any logic\u2014call an external API, book a meeting, update a CRM, or even return a dynamic response back to the agent.\n\n## Who is it for\nFor builders using [Retell](https://www.retellai.com/) who want to **extend Voice Agent functionality** with real-time custom workflows or AI-generated responses.\n\n## Prerequisites\n- Have a [Retell AI Account](https://www.retellai.com/)\n- A Retell agent with a Custom Function node in its conversation flow (see template below)\n- Set your n8n webhook URL in the Custom Function configuration (see \"How to use it\" below)\n- (Optional) Familiarity with [Retell's Custom Function docs](https://docs.retellai.com/build/conversation-flow/custom-function#custom-function)\n- Start a conversation with the agent (text or voice)\n\n## Retell Agent Example\nTo get you started, **[we've prepared a Retell Agent](https://drive.google.com/file/d/1rAcsNz-f8SyuOxO0VJ_84oPscYFpir4-/view?usp=sharing)** ready to be imported, that includes the call to this template.\n- Import the agent to your Retell workspace (top-right button [on your agent's page](https://dashboard.retellai.com/agents))\n- You will need to modify the function URL in order to call your own instance.\n- This template is a simple hotel agent that calls the custom function to confirm a booking, passing basic formatted data.\n\n## How it works\n- Retell sends a webhook to n8n whenever a Custom Function is triggered during a call (or test chat).\n- The webhook includes:\n    - Full call context (transcript, call ID, etc.)\n    - Parameters defined in the Retell function node\n- You can process this data and return a response string back to the Voice Agent in real-time.\n\n## How to use it\n1. Copy the webhook URL (e.g. `https://your-instance.app.n8n.cloud/webhook/hotel-retell-template`)\n2. Modify the Retell Custom Function webhook URL (see template description for screenshots)\n    - Edit the function\n    - Modify the URL\n3. Modify the logic in the Set node or replace it with your own custom flow\n4. Deploy and test: Retell will hit your n8n workflow during the conversation\n\n## Extension Ideas\n- Call a third-party API to fetch data (e.g. hotel availability, CRM records)\n- Use an LLM node to generate dynamic responses\n- Trigger a parallel automation (Slack message, calendar invite, etc.)\n\n#### \ud83d\udc49 [Reach out to us](mailto:hello@agentstudio.io) if you're interested in **analyzing your Retell Agent conversations**.\n"
      },
      "typeVersion": 1
    }
  ],
  "connections": {
    "Webhook": {
      "main": [
        [
          {
            "node": "[Replace me!] Set response",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "[Replace me!] Set response": {
      "main": [
        [
          {
            "node": "Respond to Webhook",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}

About this workflow

Respondtowebhook Stickynote. Uses respondToWebhook, stickyNote. Webhook trigger; 7 nodes.

Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →

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