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Build a WhatsApp Customer Support Bot with LangChain, OpenAI, and CRM Integration

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Created by: Ahmed Saadawi || ahmedsaadawi

Ahmed Saadawi

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Last update 22 days ago

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Full Customer Support WhatsApp AI Bot (Self-Hosted, Evolution API)

🧑‍💼 Who’s it for

This template is for businesses using WhatsApp for customer communication who want to automate support using AI and real-time CRM data — especially in retail, food & beverage, e-commerce, or service sectors.
It’s ideal for self-hosted n8n users with access to OpenAI and a CRM with API endpoints.

💡 What It Does

This workflow creates a multi-intent AI chatbot that handles WhatsApp conversations and connects to your CRM using HTTP APIs. It uses LangChain’s AI Agent to dynamically classify and respond to customer queries in real time.

🔄 Supported Use Cases:

  • 📍 Branch inquiries (nearest location, hours, contact)
  • 🍰 Menu & product info (availability, categories, images)
  • 🛒 Order creation & tracking
  • ⚠️ Complaint submission and follow-up
  • ⭐ Loyalty points lookup
  • ✨ Concierge & custom orders

Each user message is routed using AI to the appropriate path, where a tailored system prompt and real-time API call generate a smart, emoji-rich reply.

🚀 Key Advantages

  • Plug-and-play AI support bot with 6 distinct customer intents
  • No code logic building — uses natural language instructions via LangChain
  • Connects to your CRM using httpRequestTool nodes
  • Smart classification with OpenAI (via LangChain agent)
  • Sticky notes and prompt modularity for easy customization
  • Real-time replies using dynamic data from your API
  • Short, branded, emoji-friendly replies with support for Arabic NLP patterns

🔧 How It Works

  1. 🧲 A Webhook (via evolution-api node) receives incoming WhatsApp messages.
  2. 🧠 An AI Router Agent classifies the message intent using GPT-4.
  3. 🧰 Based on the intent, a specific system prompt is injected.
  4. 🧠 A LangChain Agent uses tools (CRM APIs) to fetch data.
  5. 💬 A final reply is generated and sent back via WhatsApp.

Everything is modular, explainable, and built with clarity in mind using sticky notes and renamed nodes.

🛠️ Requirements

  • ✅ Self-hosted n8n (required for community nodes)

  • ✅ evolution-api node (for WhatsApp messaging)

  • ✅ OpenAI API Key

  • ✅ Your own CRM HTTP API endpoints for:

    • Order creation/status
    • Menu & category lookup
    • Complaints
    • Branch search
    • Loyalty points

⚙️ Setup Instructions

  1. 🔌 Install the evolution-api node via n8n community nodes.
  2. 🔐 Replace all YOUR_AUTHORIZATION_TOKEN_HERE with your real credentials.
  3. 🧠 Add your OpenAI credentials in n8n.
  4. 🛠️ Update all CRM URLs to point to your environment.
  5. 📲 Connect the webhook URL to your WhatsApp provider.

🎨 How to Customize

  • Edit the intent categories in the AI router prompt.
  • Modify each system prompt for tone, brand, or language (supports Arabic).
  • Add more tools or branches (e.g., shipping, feedback, upselling).
  • Use n8n’s credentials manager for production security.

🧠 User Experience & Design

  • Sticky notes provide full visual explanation of logic.
  • Prompts ensure short, relevant, context-aware replies.
  • User session memory improves continuity across messages.
  • Optimized for performance and ease of onboarding.

🔍 SEO Tags

whatsapp support bot, n8n chatbot, gpt-4 ai support, langchain agent, self-hosted n8n, crm integration, customer support automation, evolution-api, loyalty bot, menu chatbot, orders automation, arabic whatsapp bot, real-time crm bot, openai n8n workflow