Automate Odoo HR Leave via WhatsApp with n8n Workflow

Transform your HR leave management from slow email chains to instant WhatsApp approvals. This n8n workflow seamlessly connects Odoo HR with WhatsApp, enabling managers to approve or reject leave requests directly from their mobile device while automatically updating your HR system.

What this workflow does

The automation operates through two intelligent flows. When an employee submits a leave request in Odoo, the Submission Flow instantly fetches employee details and sends a WhatsApp confirmation to the requester. Simultaneously, it delivers a detailed notification to the manager via WhatsApp with simple reply options: '1' to approve or '2' to reject.

The Approval Flow handles manager responses through a webhook that listens for WhatsApp replies. A Switch node intelligently routes the manager's decision to either approve or reject the request directly in Odoo, then automatically notifies the employee of the final decision via WhatsApp.

Use cases

• Remote teams needing instant leave approval without email delays
• Managers frequently away from desktop who prefer mobile notifications
• HR departments wanting to eliminate manual Odoo updates
• Companies seeking faster employee communication for time-sensitive requests
• Organizations looking to streamline their existing Odoo HR processes

Technical details

This workflow leverages Odoo API integration for seamless HR system connectivity, HTTP Request nodes with Evolution API for WhatsApp messaging, Webhook functionality for real-time message processing, and Switch nodes for intelligent decision routing.

Setup requires connecting your Odoo API credentials, configuring your Evolution API instance with proper authentication, and establishing webhook URLs for incoming WhatsApp messages. The workflow offers flexibility to swap Evolution API nodes with native Twilio or WhatsApp Cloud API alternatives, plus easy customization to add Slack or Telegram notifications for HR team updates.

Perfect for automation engineers and n8n users seeking to modernize HR leave management with mobile-first approval workflows.