Evolution API: A Developer Guide to Programmatic WhatsApp Integration

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Evolution API is an open-source tool that exposes WhatsApp communication as RESTful HTTP endpoints, allowing developers to send messages, manage contacts, and automate responses from their own servers. The API supports rich messaging formats including text, media, and buttons, and is designed to work alongside WhatsApp session management or Business Cloud API methods. Recommended deployment uses Docker on a Linux VPS with at least 4 CPU cores and 8GB RAM for production environments, as shared hosting has been shown to cause frequent authentication failures. Setup begins with scanning a QR code to link a phone number to the API instance, after which the system can begin processing requests through defined HTTP endpoints. The API is primarily used as a backend layer for CRM systems, chatbots, and automated customer service workflows.

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