This n8n workflow automates the process of refreshing OAuth 2.0 tokens for Pipedrive integration. It ensures continuous access by automatically handling token expiration, updating stored tokens, and making API requests to fetch contact data based on email. The workflow begins with webhook triggers for incoming requests, checks for existing tokens in a Supabase database, and refreshes tokens when they are invalid. It also allows manual or scheduled refreshes, seamlessly maintaining OAuth credentials without manual intervention.

Key steps include storing tokens during initial authentication, detecting invalid tokens, requesting new access/refresh tokens via API calls, and updating the database accordingly. The process repeats as needed, ensuring reliable API access for operations like searching for contacts in Pipedrive.

This workflow is ideal for scenarios requiring long-term API integrations, such as CRM automation, where token expiration can cause disruptions. It provides a robust, self-sufficient system for token management, reducing downtime and manual updates.