SSL Expiry Notifier

## 🔐 SSL Expiry Notifier (No Paid APIs)

### 👤 Who is this for?
This workflow is designed for IT admins, DevOps engineers, and web professionals who need to **monitor SSL certificate expirations** across multiple domains — **without relying on paid APIs**.

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### 🧩 What It Does
1. **Daily Trigger** runs the workflow every morning.
2. **Google Sheets Integration** fetches the list of website URLs to monitor.
3. **Free SSL API Check** (`ssl-checker.io`) is used to retrieve certificate validity data.
4. **Certificate Details** (valid from, valid till, days left) are updated back into the same Google Sheet.
5. **If Condition** checks if the SSL certificate expires in ≤7 days.
6. **Email Alert** is sent automatically for soon-to-expire certificates.

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### ⚙️ Setup Instructions
1. **Google Sheets**:  
   - Clone the sample sheet or use your own.  
   - Update the Sheet URL in the `Fetch URLs` and `Update Sheet` nodes.  
   - Ensure it contains a `URL` column.

2. **Credentials**:  
   - Connect your **Google account** (for Sheets) and **SMTP credentials** (for email notifications).

3. **Customize**:  
   - Change the alert threshold in the **IF node** (currently set to 7 days).  
   - Modify recipient list and message style in the **Send Email** node.

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### 🧠 Notes
- Uses **ssl-checker.io**, a **free public API** — no paid services needed.  
- Flexible and self-hosted monitoring solution.  
- Ideal for small teams managing multiple domains.