Google Sheets SSL Expiry Checker is a secure way to centrally check SSL certificate expiration dates directly from Google Sheets, without unnecessary rights and paid services. It works via an API script on PHP (MODX or any other hosting), supports HMAC signature, HTTPS-only, caching and anti-spam filters.
modx google-apps-script hmac-authentication php-api no-dependencies signature-verification server-side-validation secure-api ssl-checker google-sheets-addon certificate-expiry google-sheets-integration free-ssl-check timestamp-verification
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Updated
Aug 13, 2025 - PHP