Building Your First WhatsApp Chatbot

A ready-to-deploy n8n workflow that turns any WhatsApp number into an AI-powered sales agent. You feed it a product brochure PDF, and it automatically builds a knowledge base, then answers customer questions on WhatsApp in real time, remembers the conversation per user, and knows when to hand off to a website or contact.The workflow ships in two parts: a one-time setup that ingests your PDF into a vector store, and the live chatbot that runs 24/7. No coding needed to operate it once it's live.What's Inside: WhatsApp Trigger — listens for incoming messages and routes them by type (text vs media) PDF Ingestion pipeline — HTTP request → Extract from File → Recursive Text Splitter → In-Memory Vector Store, chunked at 2,000 characters AI Sales Agent (GPT-4o) — answers questions factually from the product catalogue, redirects to website/contact info when asked about purchasing Window Buffer Memory — per-user conversation memory keyed to their WhatsApp number, so every customer gets a continuous thread Vector Store Tool — lets the agent query the product brochure on demand using text-embedding-3-small Graceful fallback — non-text messages (images, voice notes, etc.) get an automatic polite reply Reply To User node — sends the AI's response back to the customer's WhatsApp instantly

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