API Integration

What is API Integration?

API integration connects two or more software systems so they can communicate automatically. When you submit a form on a website and it appears in your CRM, sends a confirmation email, and updates a spreadsheet — that is API integration at work.

How Does API Integration Work?

1. Request: One system sends a structured request (usually JSON over HTTP) to another
2. Authentication: The receiving system verifies the request using API keys or tokens
3. Processing: The receiving system performs the requested action
4. Response: It sends back a confirmation or the requested data

Common API Integration Patterns

• Webhook: System A notifies System B when something happens (real-time)
• Polling: System B periodically checks System A for new data
• Batch Sync: Systems exchange data in scheduled bulk transfers
• Event-driven: Actions trigger chains of API calls across multiple systems

Tools for API Integration

n8n and Make are the most popular no-code tools for API integration. Claude Code can also build custom API integrations directly in your application code when you need more control or better performance.

Key Takeaway: API integration is the glue that holds automated systems together — without it, your tools are isolated islands.