How to Build a WhatsApp AI Agent Using Google Gemini and Flask

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Developers can create a WhatsApp bot powered by Google Gemini by connecting Meta's WhatsApp Cloud API with Google's Gemini API through a Python Flask server. The setup uses Gemini in a dual role: as the AI brain generating replies at runtime and as a coding copilot during development via the Gemini CLI or Gemini Code Assist in an IDE. The project requires a free Meta for Developers account, a Google AI Studio API key, Python 3.10 or higher, and a tool like ngrok to expose the local server to Meta's webhook. Inbound WhatsApp messages are received via a webhook POST request, processed by the Flask app, and responded to using the Gemini API through Meta's Graph API. The guide walks developers through environment setup, credential configuration, and writing the core app.py file to handle webhook verification and message responses.

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