Monitor SSL certificate expiry dates with Google Sheets & Slack alerts

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 Sheets. Check each domain’s SSL certificate details, including expiration date and days left. Update the Google Sheet with the latest SSL expiry information. Notify via Slack if any certificate is expiring soon (e.g., less than 8 days). Requirements CustomJS API key for SSL checking. Google Sheets API credentials for reading/updating domain

Help me set up the n8n workflow "Monitor SSL certificate expiry dates with Google Sheets & Slack alerts" (https://n8n.io/workflows/5172). It uses: Google Sheets, Slack. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.