The REST API Module for Perfex CRM extends the popular open-source CRM with a complete REST API layer, enabling seamless integration with third-party applications, automation tools, mobile apps, and custom workflows. Access and manage clients, leads, invoices, projects, tasks, proposals, contracts, and more via standardised API endpoints. Authenticate via API keys, use JSON request/response format, and leverage full CRUD operations across all major Perfex modules. Ideal for agencies and developers who need to connect Perfex with tools like Zapier, n8n, Slack, WhatsApp, or custom dashboards. Includes comprehensive API documentation and example requests.