{"workflow":{"id":12848,"name":"Facebook Messenger Chatbot That Learns From Your Documents","views":402,"recentViews":1,"totalViews":402,"createdAt":"2026-01-20T13:52:20.984Z","description":"# Quickstart Guide: Facebook Messenger Chatbot with Pinecone RAG\n\nStep-by-step instructions to get this workflow running in n8n.\n\n---\n\n## Prerequisites\n\n- Self-hosted n8n instance (v1.113.0+ recommended)\n- Community nodes enabled in n8n\n- Facebook Page (you must be an admin)\n- OpenAI account\n- Pinecone account (free Starter plan works)\n\n---\n\n## Workflow Architecture\n\nThis workflow uses **two webhooks** with the same URL path but different HTTP methods:\n\n| Webhook | Method | Purpose |\n|---------|--------|---------|\n| Facebook Verification Webhook | GET | Handles Facebook's webhook verification |\n| Facebook Message Webhook | POST | Receives incoming messages |\n\nBoth webhooks share the same URL: `https://your-n8n.com/webhook/facebook-messenger-webhook`\n\nn8n automatically routes requests based on HTTP method:\n- **GET** requests → Verification flow\n- **POST** requests → Message processing flow\n\n### RAG Enhancement\n\n```\nUser Message → Batching → AI Agent ─┬─ OpenAI Chat Model\n                                    ├─ Conversation Memory\n                                    └─ Pinecone Assistant Tool (RAG)\n                                              │\n                                              ▼\n                                    Search your documents\n                                              │\n                                              ▼\n                                    Answer with citations\n```\n\n---\n\n## Step 1: Install the Pinecone Assistant Community Node\n\nThe Pinecone Assistant node is a community node that must be installed separately.\n\n1. In n8n, go to **Settings** → **Community Nodes**\n2. Click **Install a community node**\n3. Enter: `@pinecone-database/n8n-nodes-pinecone-assistant`\n4. Click **Install**\n5. Restart n8n if prompted\n\n> **Note:** Community nodes must be enabled in your n8n instance. For Docker, set `N8N_COMMUNITY_PACKAGES_ALLOW_INSTALL=true`.\n\n---\n\n## Step 2: Create Pinecone Account & Assistant\n\n### 2.1 Create Pinecone Account\n\n1. Go to [Pinecone](https://www.pinecone.io/)\n2. Sign up for a free account (Starter plan includes 100 files per assistant)\n3. Complete the onboarding\n\n### 2.2 Create an Assistant\n\n1. In the Pinecone console, go to **Assistants**\n2. Click **Create Assistant**\n3. Name it `n8n-assistant` (or choose your own name)\n4. Select your preferred region\n5. Click **Create**\n\n### 2.3 Upload Your Documents\n\n1. Click on your newly created assistant\n2. Go to the **Files** tab\n3. Click **Upload Files**\n4. Upload your documents (PDFs, text files, etc.)\n5. Wait for processing to complete\n\n### 2.4 Get Your Pinecone API Key\n\n1. In the Pinecone console, click on your profile/account\n2. Go to **API Keys**\n3. Copy your API key (or create a new one)\n\n---\n\n## Step 3: Get Your OpenAI API Key\n\n1. Go to [OpenAI Platform](https://platform.openai.com/api-keys)\n2. Sign in with your OpenAI account\n3. Click **Create new secret key**\n4. Copy and save the API key\n\n---\n\n## Step 4: Create Facebook App & Get Page Access Token\n\n### 4.1 Create Facebook App\n\n1. Go to [Facebook Developers](https://developers.facebook.com)\n2. Click **My Apps** → **Create App**\n3. Select **Other** → **Next**\n4. Select **Business** → **Next**\n5. Enter app name and contact email\n6. Click **Create App**\n\n### 4.2 Add Messenger Product\n\n1. In your app dashboard, scroll to **Add products to your app**\n2. Find **Messenger** and click **Set up**\n\n### 4.3 Connect Your Facebook Page\n\n1. In Messenger settings, find **Access Tokens** section\n2. Click **Add or Remove Pages**\n3. Select your Facebook Page and grant permissions\n4. Click **Done**\n\n### 4.4 Generate Page Access Token\n\n1. Back in Messenger settings, find your page in the list\n2. Click **Generate Token**\n3. Copy and save the token\n\n---\n\n## Step 5: Create Your Verify Token\n\nThe verify token is a secret string for Facebook webhook verification.\n\n1. Create a random string (e.g., `my-secret-token-12345`)\n2. Save this value - you'll need it in Steps 7 and 10\n\n---\n\n## Step 6: Create n8n Credentials\n\n### 6.1 Pinecone Credential\n\n1. In n8n, go to **Credentials** → **Add Credential**\n2. Search for **\"Pinecone\"** (or **\"Pinecone API\"**)\n3. Configure:\n   - **Name:** `Pinecone API`\n   - **API Key:** Paste your Pinecone API key from Step 2.4\n4. Click **Save**\n\n### 6.2 OpenAI API Credential\n\n1. In n8n, go to **Credentials** → **Add Credential**\n2. Search for **\"OpenAI API\"**\n3. Configure:\n   - **Name:** `OpenAI API`\n   - **API Key:** Paste your OpenAI API key from Step 3\n4. Click **Save**\n\n### 6.3 Facebook Graph API Credential\n\n1. In n8n, go to **Credentials** → **Add Credential**\n2. Search for **\"Facebook Graph API\"**\n3. Configure:\n   - **Name:** `Facebook Page Access Token`\n   - **Access Token:** Paste your Page Access Token from Step 4.4\n4. Click **Save**\n\n---\n\n## Step 7: Import the Workflow\n\n1. In n8n, click **Add Workflow** → **Import from File**\n2. Select the `workflow.json` file from this folder\n3. The workflow will open in the editor\n\n### 7.1 Configure the Verify Token\n\n1. Find the **\"Is Token Valid?\"** node\n2. Click on the node to open its settings\n3. In the conditions, find **Value 2** that shows `YOUR_VERIFY_TOKEN_HERE`\n4. Replace it with your verify token from Step 5\n\n### 7.2 Configure the Pinecone Assistant Name\n\n1. Find the **\"Get context snippets in Pinecone Assistant\"** node\n2. Click on the node to open its settings\n3. Change **Assistant Name** from `n8n-assistant` to your actual assistant name (from Step 2.2)\n\n---\n\n## Step 8: Connect Credentials to Nodes\n\n### 8.1 Connect Facebook Credential\n\nUpdate these 3 nodes with your Facebook credential:\n\n1. Click on **\"Send Seen Indicator\"** → Select your `Facebook Page Access Token` credential\n2. Click on **\"Send Typing Indicator\"** → Select your `Facebook Page Access Token` credential\n3. Click on **\"Send Response to User\"** → Select your `Facebook Page Access Token` credential\n\n### 8.2 Connect OpenAI Credential\n\n1. Click on **\"OpenAI Chat Model\"** → Select your `OpenAI API` credential\n\n### 8.3 Connect Pinecone Credential\n\n1. Click on **\"Get context snippets in Pinecone Assistant\"** → Select your `Pinecone API` credential\n\n---\n\n## Step 9: Publish the Workflow\n\n1. Click **Save** to save the workflow\n2. Click the **Publish** button to make the workflow live\n3. Copy the webhook URL (e.g., `https://your-n8n.com/webhook/facebook-messenger-webhook`)\n\n---\n\n## Step 10: Configure Facebook Webhook\n\n1. Go to [Facebook Developers](https://developers.facebook.com) → Your App → Messenger Settings\n2. Find **Webhooks** section\n3. Click **Add Callback URL**\n4. Enter:\n   - **Callback URL:** Your n8n webhook URL from Step 9\n   - **Verify Token:** Same value from Step 5\n5. Click **Verify and Save**\n6. After verification, subscribe to webhook fields:\n   - `messages` (required)\n   - `messaging_postbacks` (recommended)\n\n---\n\n## Step 11: Test Your Chatbot\n\n### 11.1 Add Test Users (if needed)\n\nWith Standard Access, only users with app roles can message the bot:\n\n1. Go to your Facebook App → **App Roles** → **Roles**\n2. Add users as **Testers**\n3. Those users must accept the invitation\n\n### 11.2 Send a Test Message\n\n1. Open Facebook Messenger\n2. Search for your Facebook Page\n3. Try these test messages:\n   - `\"Hello!\"` - Should get a friendly greeting\n   - `\"What information do you have?\"` - Should search your documents\n   - `\"Tell me about [topic in your docs]\"` - Should return relevant information with context\n\n---\n\n## How Pinecone RAG Works\n\n```\nUser asks: \"What are your return policies?\"\n         │\n         ▼\n┌─────────────────────────┐\n│  AI Agent receives msg  │\n└─────────┬───────────────┘\n          │\n          ▼\n┌─────────────────────────┐\n│  Calls Pinecone Tool    │ → Searches your documents\n└─────────┬───────────────┘\n          │\n          ▼\n┌─────────────────────────┐\n│  Gets relevant snippets │ ← \"Return Policy.pdf: Items can be...\"\n└─────────┬───────────────┘\n          │\n          ▼\n┌─────────────────────────┐\n│  AI formulates answer   │ → \"According to our policy, items can be...\"\n└─────────────────────────┘\n```\n\n---\n\n## Troubleshooting\n\n| Problem | Solution |\n|---------|----------|\n| \"Pinecone Assistant Tool\" not found | Ensure community node is installed (Step 1) |\n| \"No relevant information found\" | Upload more documents to your Pinecone Assistant |\n| Webhook verification fails | Check verify token matches in n8n and Facebook |\n| No response from bot | Check n8n execution logs for errors |\n| \"Error validating access token\" | Regenerate Page Access Token in Facebook |\n| AI Agent not using Pinecone tool | After import, open the \"AI Agent1\" node, make a small edit to the system message (e.g., add a space), and save. This re-initializes the tool bindings. |\n\n---\n\n## Customization\n\n### Change the AI Behavior\n\nEdit the **\"AI Agent1\"** node's system message to:\n- Adjust how it cites sources\n- Change personality/tone\n- Add specific instructions for your use case\n\n### Change the Assistant\n\nUpdate the **\"Get context snippets in Pinecone Assistant\"** node to use a different assistant name.\n\n### Adjust Response Length\n\nThe workflow truncates responses to 1900 characters for Messenger. Edit the **\"Format Response\"** node to change this.\n\n---\n\n## Resources\n\n- [Pinecone Assistant Documentation](https://docs.pinecone.io/guides/assistant/overview)\n- [Pinecone Assistant n8n Node (GitHub)](https://github.com/pinecone-io/n8n-nodes-pinecone-assistant)\n- [Facebook Messenger Platform](https://developers.facebook.com/docs/messenger-platform)\n- [OpenAI API Documentation](https://platform.openai.com/docs)\n- [n8n Documentation](https://docs.n8n.io/)\n","workflow":{"meta":{"templateCredsSetupCompleted":false},"name":"Facebook Messenger AI Chatbot with Pinecone RAG","tags":[],"nodes":[{"id":"866ee81f-f01b-4f5f-a1b8-d4d005a262ea","name":"Sticky Note - Overview","type":"n8n-nodes-base.stickyNote","position":[5008,3056],"parameters":{"color":4,"width":520,"height":800,"content":"# Facebook Messenger AI Chatbot with Pinecone RAG\n\n## Who is this for?\nBusinesses who want to automate customer interactions on Facebook Messenger using AI that can answer questions from your documents.\n\n## What does it do?\n- Receives messages from Facebook Messenger\n- Batches rapid consecutive messages together\n- Retrieves relevant context from your documents via Pinecone Assistant\n- Processes messages with OpenAI (GPT-4o-mini)\n- Maintains conversation memory\n- Sends intelligent AI responses with document citations\n\n## Setup Requirements\n1. **Facebook App** with Messenger product enabled\n2. **Facebook Page** connected to the app\n3. **OpenAI API Key**\n4. **Pinecone Account** with Assistant created\n5. **Pinecone Assistant community node** installed\n\n## Quick Start\n1. Install the Pinecone Assistant community node\n2. Configure credentials (Facebook, OpenAI, Pinecone)\n3. Create a Pinecone Assistant and upload your documents\n4. Set your verify token in \"Is Token Valid?\" node\n5. Update the Assistant name in \"Pinecone Assistant Tool\" node\n6. Publish the workflow\n7. Configure Facebook webhook URL\n8. Test by messaging your Facebook Page!\n\n"},"typeVersion":1},{"id":"cda30df8-a761-4dfa-b655-2b8a07288261","name":"Sticky Note - Webhook Verification","type":"n8n-nodes-base.stickyNote","position":[5600,2768],"parameters":{"color":7,"width":520,"height":280,"content":"## 1. Webhook Verification\n\nFacebook sends a GET request to verify your webhook URL during setup.\n\n**How it works:**\n1. Facebook sends `hub.verify_token` and `hub.challenge`\n2. We validate the token matches your secret\n3. If valid, return the challenge to confirm\n4. If invalid, return 403 Forbidden\n\n**Important:** Change `YOUR_VERIFY_TOKEN_HERE` in the \"Is Token Valid?\" node to your own secret token."},"typeVersion":1},{"id":"12b7a811-0266-40f7-9b71-479d2407e9b2","name":"Sticky Note - Message Receipt","type":"n8n-nodes-base.stickyNote","position":[5616,3728],"parameters":{"color":7,"width":540,"height":332,"content":"## 2. Receive & Filter Messages\n\nHandles incoming POST requests from Facebook when users send messages.\n\n**How it works:**\n1. Immediately acknowledge with `EVENT_RECEIVED` (required by Facebook)\n2. Filter out:\n   - Echo messages (messages we sent)\n   - Non-text messages\n   - Empty messages\n\nOnly valid user text messages proceed to processing."},"typeVersion":1},{"id":"3164fd54-2389-4e8c-9bf1-b6e3d5d9949f","name":"Sticky Note - Message Batching","type":"n8n-nodes-base.stickyNote","position":[6320,3040],"parameters":{"color":7,"width":740,"height":300,"content":"## 3. Message Batching (Smart Feature!)\n\nUsers often send multiple quick messages. This section combines them into one request.\n\n**How it works:**\n1. Store each message in workflow static data\n2. Send \"seen\" indicator so user knows we received it\n3. Wait 3 seconds for additional messages\n4. Combine all messages from the same user\n5. Process as a single conversation turn\n\n**Benefit:** Reduces API calls and provides more context to the AI."},"typeVersion":1},{"id":"63db4412-d223-4a93-8f6d-be45941301c3","name":"Sticky Note - AI Processing","type":"n8n-nodes-base.stickyNote","position":[7536,2784],"parameters":{"color":7,"width":480,"height":480,"content":"## 4. AI Agent with Pinecone RAG\n\nThe brain of the chatbot - powered by OpenAI + Pinecone.\n\n**Components:**\n- **OpenAI Chat Model:** Uses GPT-4o-mini for responses\n- **Conversation Memory:** Remembers last 50 messages per user\n- **Pinecone Assistant Tool:** Retrieves relevant context from your documents\n\n**RAG Features:**\n- Searches your documents for relevant information\n- Provides citations from source documents\n- Acknowledges when information is not available\n- Maintains context across conversations\n\n**Customize:**\n- Edit the system prompt in the AI Agent node\n- Change the Assistant name in Pinecone Assistant Tool\n- Upload documents to your Pinecone Assistant"},"typeVersion":1},{"id":"a0f6ec23-6bc9-45ee-b1f0-944f06d6d5e1","name":"Sticky Note - Pinecone Setup","type":"n8n-nodes-base.stickyNote","position":[7856,3712],"parameters":{"color":3,"width":400,"height":280,"content":"### Pinecone Setup\n\n1. Create account at [pinecone.io](https://www.pinecone.io)\n2. Create an Assistant named `n8n-assistant`\n3. Upload your documents to the Assistant\n4. Get your API key from the Pinecone console\n5. In n8n: Install the community node:\n   `@pinecone-database/n8n-nodes-pinecone-assistant`\n6. Create Pinecone credential with your API key\n7. Update the Assistant name in the tool node"},"typeVersion":1},{"id":"1ae54fd5-b47a-4f87-b94c-4c5535ddac0e","name":"Sticky Note - OpenAI Setup","type":"n8n-nodes-base.stickyNote","position":[7168,3760],"parameters":{"color":3,"width":380,"height":216,"content":"### OpenAI Credential Setup\n\n1. Go to [OpenAI API Keys](https://platform.openai.com/api-keys)\n2. Click **Create new secret key**\n3. Copy the key\n4. In n8n: Click the OpenAI node -> Credential -> Create New\n5. Paste your API key and save"},"typeVersion":1},{"id":"a1965c3c-2d3b-4a67-b10f-197ebca239b8","name":"Sticky Note - Response","type":"n8n-nodes-base.stickyNote","position":[8064,2976],"parameters":{"color":7,"width":540,"height":280,"content":"## 5. Format & Send Response\n\n**How it works:**\n1. Format AI response for Messenger (remove markdown)\n2. Truncate if over 1900 characters\n3. Send via Facebook Graph API\n\n**Response includes:**\n- Proper recipient ID\n- Message type: RESPONSE\n- Clean, readable text"},"typeVersion":1},{"id":"67a7da1b-8110-48be-824c-d3429a8f8054","name":"Sticky Note - Facebook Setup","type":"n8n-nodes-base.stickyNote","position":[6384,3632],"parameters":{"color":3,"width":460,"height":240,"content":"### Facebook Graph API Credential Setup\n\n1. Create a Facebook App at [developers.facebook.com](https://developers.facebook.com)\n2. Add **Messenger** product to your app\n3. Connect a Facebook Page\n4. Generate a **Page Access Token**\n5. In n8n: Create Facebook Graph API credential\n6. Paste the Page Access Token"},"typeVersion":1},{"id":"5c1c1a54-5e97-429f-a944-8264882d9dc7","name":"Facebook Verification Webhook","type":"n8n-nodes-base.webhook","position":[5632,3168],"webhookId":"facebook-messenger-webhook-verify","parameters":{"path":"facebook-messenger-webhook","options":{},"responseMode":"responseNode"},"typeVersion":2},{"id":"cd320e99-8f67-4499-827c-f440cc49bd40","name":"Facebook Message Webhook","type":"n8n-nodes-base.webhook","position":[5648,3520],"webhookId":"facebook-messenger-webhook-message","parameters":{"path":"facebook-messenger-webhook","options":{},"httpMethod":"POST","responseMode":"responseNode"},"typeVersion":2},{"id":"9ea3708e-d19c-4c40-819c-77fa7e709154","name":"Is Token Valid?","type":"n8n-nodes-base.if","position":[5856,3168],"parameters":{"options":{},"conditions":{"options":{"version":1,"leftValue":"","caseSensitive":true,"typeValidation":"strict"},"combinator":"and","conditions":[{"id":"verify-token","operator":{"type":"string","operation":"equals"},"leftValue":"={{ $json.query['hub.verify_token'] }}","rightValue":"YOUR_VERIFY_TOKEN_HERE"}]}},"typeVersion":2},{"id":"d21d92ed-91b8-44f9-bef2-6d9694d285f1","name":"Respond with Challenge","type":"n8n-nodes-base.respondToWebhook","position":[6080,3088],"parameters":{"options":{},"respondWith":"text","responseBody":"={{ $json.query['hub.challenge'] }}"},"typeVersion":1.1},{"id":"80e766d3-414c-4597-bf8e-9ae5ce9c47a8","name":"Respond Forbidden","type":"n8n-nodes-base.respondToWebhook","position":[6080,3248],"parameters":{"options":{"responseCode":403},"respondWith":"text","responseBody":"Verification failed"},"typeVersion":1.1},{"id":"20969b8e-8f11-4881-a0a9-4df73532bc52","name":"Acknowledge Event","type":"n8n-nodes-base.respondToWebhook","position":[5872,3520],"parameters":{"options":{"responseCode":200},"respondWith":"text","responseBody":"EVENT_RECEIVED"},"typeVersion":1.1},{"id":"dbd43cd0-f776-49e8-9071-d191a6c48389","name":"Filter Valid Messages","type":"n8n-nodes-base.if","position":[6096,3520],"parameters":{"options":{},"conditions":{"options":{"leftValue":"","caseSensitive":true,"typeValidation":"loose"},"combinator":"and","conditions":[{"id":"has-message","operator":{"type":"string","operation":"exists"},"leftValue":"={{ $json.body?.entry?.[0]?.messaging?.[0]?.message?.text }}","rightValue":""},{"id":"not-echo","operator":{"type":"boolean","operation":"notEquals"},"leftValue":"={{ $json.body?.entry?.[0]?.messaging?.[0]?.message?.is_echo }}","rightValue":true}]}},"typeVersion":2},{"id":"d16aa51b-896a-4660-9da3-a8a9c5dcc4cc","name":"Store Message for Batching","type":"n8n-nodes-base.code","position":[6320,3424],"parameters":{"jsCode":"// Extract message data from Facebook webhook\nconst entry = $input.first().json.body?.entry?.[0];\nconst messaging = entry?.messaging?.[0];\n\nconst userId = messaging?.sender?.id;\nconst pageId = messaging?.recipient?.id;\nconst messageText = messaging?.message?.text;\nconst timestamp = messaging?.timestamp || Date.now();\nconst messageId = messaging?.message?.mid;\n\n// Store in workflow static data for batching\nconst staticData = $getWorkflowStaticData('global');\n\nif (!staticData.messageBatches) {\n  staticData.messageBatches = {};\n}\n\nif (!staticData.messageBatches[userId]) {\n  staticData.messageBatches[userId] = {\n    messages: [],\n    firstMessageTime: timestamp,\n    pageId: pageId\n  };\n}\n\nstaticData.messageBatches[userId].messages.push({\n  text: messageText,\n  timestamp: timestamp,\n  messageId: messageId\n});\n\nreturn {\n  json: {\n    userId,\n    pageId,\n    messageText,\n    timestamp,\n    messageId,\n    batchCount: staticData.messageBatches[userId].messages.length\n  }\n};"},"typeVersion":2},{"id":"afd69549-cb23-4fa6-9312-df2694e3fa2e","name":"Send Seen Indicator","type":"n8n-nodes-base.httpRequest","onError":"continueRegularOutput","position":[6544,3424],"parameters":{"url":"=https://graph.facebook.com/v21.0/me/messages","method":"POST","options":{},"jsonBody":"={\n  \"recipient\": {\n    \"id\": \"{{ $json.userId }}\"\n  },\n  \"sender_action\": \"mark_seen\"\n}","sendBody":true,"specifyBody":"json","authentication":"predefinedCredentialType","nodeCredentialType":"facebookGraphApi"},"credentials":{"facebookGraphApi":{"id":"REPLACE_WITH_YOUR_CREDENTIAL_ID","name":"Facebook Graph API"}},"typeVersion":4.2,"alwaysOutputData":true},{"id":"71c1f6fc-aeb8-43e2-95a3-fc6e2971e518","name":"Wait 3 Seconds","type":"n8n-nodes-base.wait","position":[6768,3424],"webhookId":"wait-batch","parameters":{"amount":3},"typeVersion":1.1},{"id":"12f6e864-7a6f-471a-b321-70eb5fbdfcc3","name":"Retrieve Batched Messages","type":"n8n-nodes-base.code","position":[6992,3424],"parameters":{"jsCode":"// Retrieve all batched messages for this user\n// Get userId from Store node directly (not from input, which is HTTP response)\nconst userId = $('Store Message for Batching').first().json.userId;\nconst pageId = $('Store Message for Batching').first().json.pageId;\n\nconst staticData = $getWorkflowStaticData('global');\nconst userBatch = staticData.messageBatches?.[userId];\n\nif (!userBatch || userBatch.messages.length === 0) {\n  return { json: { skip: true } };\n}\n\n// Combine all messages into one\nconst combinedMessage = userBatch.messages\n  .sort((a, b) => a.timestamp - b.timestamp)\n  .map(m => m.text)\n  .join(' ');\n\n// Clear the batch\ndelete staticData.messageBatches[userId];\n\nreturn {\n  json: {\n    userId,\n    pageId,\n    combinedMessage,\n    messageCount: userBatch.messages.length,\n    skip: false\n  }\n};"},"typeVersion":2},{"id":"9475f390-beed-4654-9883-ac2940b79233","name":"Has Messages to Process?","type":"n8n-nodes-base.if","position":[7216,3424],"parameters":{"options":{},"conditions":{"options":{"version":1,"leftValue":"","caseSensitive":true,"typeValidation":"strict"},"combinator":"and","conditions":[{"id":"not-skip","operator":{"type":"boolean","operation":"equals"},"leftValue":"={{ $json.skip }}","rightValue":false}]}},"typeVersion":2},{"id":"54254117-c8b2-4ff6-becd-7ae6c8b4db8d","name":"Send Typing Indicator","type":"n8n-nodes-base.httpRequest","onError":"continueRegularOutput","position":[7440,3328],"parameters":{"url":"=https://graph.facebook.com/v21.0/me/messages","method":"POST","options":{},"jsonBody":"={\n  \"recipient\": {\n    \"id\": \"{{ $json.userId }}\"\n  },\n  \"sender_action\": 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