Automated Zalo OA Token Management with OAuth and Webhook Integration

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Description (How it works) This workflow keeps your Zalo Official Account access token valid and easy to reuse across other flows—no external server required. High-level steps Scheduled refresh runs on an interval to renew the access token before it expires. Static Data cache (global) stores access/refresh tokens + expiries for reuse by any downstream node. OAuth exchange calls Zalo OAuth v4 with your app_id and secret_key to get a fresh access token. Immediate output returns the current