Monitor SSL Certificate Expiry Dates with Google Sheets & Slack Alerts

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> ⚠️ Notice: > Community nodes like @custom-js/n8n-nodes-pdf-toolkit can only be installed on self-hosted instances of n8n. This n8n workflow illustrates how to monitor and track SSL certificate expiration dates for any domain using the SSL Checker node from customJS. It automatically updates a Google Sheet with the number of days left until expiry and sends a Slack notification when certificates are about to expire. What this workflow does Input** a list of domains from Google