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Build a Custom AI Chatbot for Your Business: A Step-by-Step Tutorial

1. Prerequisites and Setup

• Set up a Python 3.9+ environment with virtualenv and install core dependencies (openai, python-dotenv, fastapi).
• Create an OpenAI account, generate an API key, and store it securely in a .env file.
• Choose a code editor (VS Code recommended) and verify your setup with a simple “Hello World” API call.

2. Designing the Conversation Flow

• Map out your chatbot’s persona, tone, and key use cases (e.g., customer support, lead qualification, FAQ).
• Define system prompts and message history structure to guide the model’s behavior.
• Plan fallback responses and error handling for out-of-scope or ambiguous user inputs.

3. Building the Backend API with FastAPI

• Create a FastAPI app with a single POST endpoint that accepts user messages and returns AI responses.
• Implement conversation memory using a simple message list or a database for persistent history.
• Add
  

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  Written byTheo Grant

  Theo Grant explores real-world AI applications, automation workflows, and hands-on tutorials at AI In Action Hub. Theo breaks down complex AI concepts into practical guides that help professionals and creators leverage AI in their daily work.