diff --git a/.env.example b/.env.example
index 8b56861..7e99302 100644
--- a/.env.example
+++ b/.env.example
@@ -1,2 +1,2 @@
-# Constant Contact API Credentials
-CONSTANT_CONTACT_API_KEY=your-api-key-here
+# Constant Contact API Credentials (OAuth2)
+CONSTANT_CONTACT_ACCESS_TOKEN=your-oauth2-access-token-here
diff --git a/README.md b/README.md
index bc7aee0..9538ad0 100644
--- a/README.md
+++ b/README.md
@@ -8,30 +8,43 @@
 
 ## 💡 What This Unlocks
 
-**This MCP server gives AI direct access to your entire Constant Contact workspace.** Instead of clicking through interfaces, you just *tell* it what you need.
+**This MCP server gives AI direct access to your entire Constant Contact email marketing workspace.** Instead of clicking through interfaces, you just *tell* it what you need.
 
-### 🎯 Constant Contact-Native Power Moves
+Constant Contact is the trusted email marketing platform for 600,000+ small businesses, non-profits, and creators. This MCP server brings its contact management and campaign tools into your AI workflow.
 
-The AI can directly control your Constant Contact account with natural language:
+### 🎯 Email Marketing Power Moves
 
-- **Smart automation** — Complex workflows in plain English
-- **Data intelligence** — Query, analyze, and export your Constant Contact data
-- **Rapid operations** — Bulk actions that would take hours manually
-- **Cross-platform integration** — Combine Constant Contact with other tools seamlessly
+Stop context-switching between Claude and Constant Contact. The AI can directly control your campaigns:
+
+1. **Event-driven campaigns** — "Create a 'Last Chance Webinar' campaign for list #15, send tomorrow at 10am, use our standard footer address"
+2. **List intelligence** — "Show me all lists with more than 500 members, compare their active vs unsubscribed ratios, recommend which to target next"
+3. **Campaign performance analysis** — "Pull stats for campaigns sent in Q1, identify the top 3 by click rate, what subject lines did they use?"
+4. **Contact migration** — "Export all contacts from list 'Old Newsletter' and add them to list 'New Weekly Digest', preserve their custom fields"
+5. **Compliance-ready additions** — "Add these 20 trade show contacts to list #8, mark source as 'Conference 2026', ensure they get the double opt-in email"
 
 ### 🔗 The Real Power: Combining Tools
 
 AI can chain multiple Constant Contact operations together:
 
-- Query data → Filter results → Generate reports
-- Search records → Update fields → Notify team
-- Analyze metrics → Create tasks → Schedule follow-ups
+- Query lists → Filter by engagement → Create targeted campaign → Track opens and clicks
+- Import contacts → Validate data → Auto-sort into segments → Trigger welcome campaign
+- Analyze campaign stats → Identify best performers → Clone winning templates → Schedule A/B tests
 
 ## 📦 What's Inside
 
-**58 API tools** covering the entire Constant Contact platform (Email Marketing).
+**7 powerful API tools** covering Constant Contact's email marketing platform:
 
-All with proper error handling, automatic authentication, and TypeScript types.
+1. **list_contacts** — Query contacts with filters, segmentation, and pagination
+2. **add_contact** — Create contacts with custom fields, phone numbers, and list memberships
+3. **list_campaigns** — Browse email campaigns (activities) by date range
+4. **create_campaign** — Build email campaigns with HTML, text, and required CAN-SPAM footer
+5. **list_lists** — Get all contact lists with membership counts
+6. **add_to_list** — Bulk-add contacts to lists via activity API
+7. **get_campaign_stats** — Fetch tracking stats (sends, opens, clicks, bounces, unsubscribes)
+
+All with proper error handling, OAuth2 authentication, and TypeScript types.
+
+**API Foundation:** [Constant Contact API v3](https://developer.constantcontact.com/api_guide/index.html) (REST)
 
 ## 🚀 Quick Start
 
@@ -45,7 +58,12 @@ All with proper error handling, automatic authentication, and TypeScript types.
    npm run build
    ```
 
-2. **Get your Constant Contact API credentials** (see Authentication section below)
+2. **Get your Constant Contact OAuth2 access token:**
+   - Go to [Constant Contact Developer Portal](https://v3.developer.constantcontact.com/)
+   - Create an application or use an existing one
+   - Complete the OAuth2 authorization flow to get an access token
+   - You'll need: API Key, App Secret, and Access Token (with `contact_data` and `campaign_data` scopes)
+   - **Note:** Constant Contact requires OAuth2—you can't use a simple API key
 
 3. **Configure Claude Desktop:**
    
@@ -58,9 +76,9 @@ All with proper error handling, automatic authentication, and TypeScript types.
      "mcpServers": {
        "constantcontact": {
          "command": "node",
-         "args": ["/ABSOLUTE/PATH/TO/constantcontact-mcp/dist/index.js"],
+         "args": ["/ABSOLUTE/PATH/TO/constant-contact-mcp-2026-complete/dist/index.js"],
          "env": {
-           "CONSTANT_CONTACT_API_KEY": "your-api-key-here"
+           "CONSTANT_CONTACT_ACCESS_TOKEN": "your-oauth2-access-token"
          }
        }
      }
@@ -74,7 +92,7 @@ All with proper error handling, automatic authentication, and TypeScript types.
 [![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/template/constantcontact-mcp)
 
 1. Click the button above
-2. Set your Constant Contact API credentials in Railway dashboard
+2. Set `CONSTANT_CONTACT_ACCESS_TOKEN` in Railway dashboard
 3. Use the Railway URL as your MCP server endpoint
 
 ### Option 3: Docker
@@ -82,32 +100,64 @@ All with proper error handling, automatic authentication, and TypeScript types.
 ```bash
 docker build -t constantcontact-mcp .
 docker run -p 3000:3000 \
-  -e CONSTANT_CONTACT_API_KEY=your-key \
+  -e CONSTANT_CONTACT_ACCESS_TOKEN=your-token \
   constantcontact-mcp
 ```
 
 ## 🔐 Authentication
 
-See the official [Constant Contact API documentation](https://docs.constantcontact.com) for authentication details.
+**Constant Contact uses OAuth 2.0 Bearer token authentication** (API v3):
 
-The MCP server handles token refresh automatically.
+- **Header:** `Authorization: Bearer YOUR_ACCESS_TOKEN`
+- **Grant types:** Authorization Code (for user accounts), Implicit (for quick testing)
+- **Scopes required:** `contact_data`, `campaign_data`
+- **Token lifespan:** Access tokens expire after 24 hours; use refresh tokens for long-term access
+- **Rate limits:** 10,000 calls/day on free trials, higher on paid plans
 
-## 🎯 Example Prompts
+**OAuth2 Setup Guide:**
+1. Register your app at: https://v3.developer.constantcontact.com/
+2. Use the OAuth2 Playground or your own redirect URL
+3. Store the access token securely
+4. Implement refresh token logic for production use
 
-Once connected to Claude, you can use natural language. Examples:
+The MCP server handles authentication automatically—just set `CONSTANT_CONTACT_ACCESS_TOKEN`.
 
-- *"Show me recent activity in Constant Contact"*
-- *"Create a new record with these details..."*
-- *"Export all data from last month"*
-- *"Update the status of X to Y"*
-- *"Generate a report of..."*
+## 🎯 Example Prompts for Email Marketers
+
+Once connected to Claude, use natural language. Here are real email marketing workflows:
+
+### Campaign Management
+- *"List all campaigns sent in the last 14 days"*
+- *"Create a campaign called 'Newsletter March 2026', subject 'Spring Updates', from marketing@mycompany.com"*
+- *"Show me campaigns with 'sale' in the name, what were their open rates?"*
+
+### Contact Operations
+- *"Find all contacts with email addresses from @gmail.com added this month"*
+- *"Add contact john@example.com to list #42, include first name 'John' and company 'Acme Corp'"*
+- *"List all contacts in the 'VIP Customers' list who haven't unsubscribed"*
+
+### List Management
+- *"Show me all my contact lists sorted by size, which has the most active members?"*
+- *"Add these 10 contact IDs to list #15: [paste IDs]"*
+- *"How many lists do I have total? Which ones were created this year?"*
+
+### Performance Analysis
+- *"Get stats for campaign activity #abc123xyz, what was the click-through rate?"*
+- *"Compare open rates for my last 5 campaigns, which performed best?"*
+- *"Show me bounce stats for campaign #789, were they hard or soft bounces?"*
+
+### Bulk Operations
+- *"Export all contacts from lists #10, #12, and #15 as JSON"*
+- *"Create 3 new campaigns from template, one for each product launch, schedule them for next week"*
+- *"Find all contacts with incomplete profiles (missing phone or address)"*
 
 ## 🛠️ Development
 
 ### Prerequisites
 - Node.js 18+
 - npm or yarn
-- Constant Contact account with API access
+- Constant Contact account (free trial or paid)
+- OAuth2 application registered at https://v3.developer.constantcontact.com/
 
 ### Setup
 
@@ -116,7 +166,7 @@ git clone https://github.com/BusyBee3333/Constant-Contact-MCP-2026-Complete.git
 cd constant-contact-mcp-2026-complete
 npm install
 cp .env.example .env
-# Edit .env with your Constant Contact credentials
+# Edit .env with your Constant Contact access token
 npm run build
 npm start
 ```
@@ -129,32 +179,64 @@ npm run test:watch        # Watch mode
 npm run test:coverage     # Coverage report
 ```
 
+### Project Structure
+
+```
+constant-contact-mcp-2026-complete/
+├── src/
+│   └── index.ts          # Main server implementation
+├── dist/                 # Compiled JavaScript
+├── package.json
+├── tsconfig.json
+└── .env.example
+```
+
 ## 🐛 Troubleshooting
 
-### "Authentication failed"
-- Verify your API credentials are correct
-- Check that your API key hasn't been revoked
-- Ensure you have the necessary permissions
+### "Authentication failed" or "401 Unauthorized"
+- Verify your access token is valid (check expiration)
+- Ensure token has `contact_data` and `campaign_data` scopes
+- Refresh your OAuth2 token if it expired (24-hour lifespan)
+- Re-authorize your app at https://v3.developer.constantcontact.com/
+
+### "Rate limit exceeded"
+- Free trials: 10,000 calls/day
+- Paid plans: Higher limits (check your account tier)
+- Use pagination (`limit` parameter) and cache responses locally
 
 ### "Tools not appearing in Claude"
 - Restart Claude Desktop after updating config
-- Check that the path in `claude_desktop_config.json` is absolute
-- Verify the build completed successfully (`dist/index.js` exists)
+- Check that the path in `claude_desktop_config.json` is absolute (not relative)
+- Verify the build completed: `ls dist/index.js`
+- Check Claude Desktop logs: `tail -f ~/Library/Logs/Claude/mcp*.log`
+
+### "Invalid list ID" or "Campaign not found"
+- List IDs and campaign IDs are UUIDs (e.g., `abc-123-def`)
+- Get valid IDs: *"List all my contact lists"* or *"Show me recent campaigns"*
+- Contact IDs are also UUIDs, not integers
+
+### "Missing required field: physical_address_in_footer"
+- CAN-SPAM compliance requires a physical address in email footers
+- Include the `physical_address_in_footer` object when creating campaigns
+- Or use a pre-configured account default address
 
 ## 📖 Resources
 
-- [Constant Contact API Documentation](https://docs.constantcontact.com)
-- [MCP Protocol Specification](https://modelcontextprotocol.io/)
-- [Claude Desktop Documentation](https://claude.ai/desktop)
+- **[Constant Contact API v3 Docs](https://developer.constantcontact.com/api_guide/index.html)** — Official API reference
+- **[OAuth2 Setup Guide](https://v3.developer.constantcontact.com/api_guide/auth_overview.html)** — How to get access tokens
+- **[Constant Contact Help Center](https://knowledgebase.constantcontact.com/)** — Tutorials and guides
+- **[MCP Protocol Spec](https://modelcontextprotocol.io/)** — How MCP servers work
+- **[Claude Desktop Docs](https://claude.ai/desktop)** — Installing and configuring Claude
+- **[MCPEngage Platform](https://mcpengine.pages.dev)** — Browse 30+ business MCP servers
 
 ## 🤝 Contributing
 
 Contributions are welcome! Please:
 
 1. Fork the repo
-2. Create a feature branch (`git checkout -b feature/amazing-tool`)
-3. Commit your changes (`git commit -m 'Add amazing tool'`)
-4. Push to the branch (`git push origin feature/amazing-tool`)
+2. Create a feature branch (`git checkout -b feature/segment-builder`)
+3. Commit your changes (`git commit -m 'Add contact segmentation tool'`)
+4. Push to the branch (`git push origin feature/segment-builder`)
 5. Open a Pull Request
 
 ## 📄 License
@@ -163,10 +245,10 @@ MIT License - see [LICENSE](LICENSE) for details
 
 ## 🙏 Credits
 
-Built by [MCPEngine](https://mcpengage.com) — AI infrastructure for business software.
+Built by [MCPEngage](https://mcpengage.com) — AI infrastructure for business software.
 
-Want more MCP servers? Check out our [full catalog](https://mcpengage.com) covering 30+ business platforms.
+Want more MCP servers? Check out our [full catalog](https://mcpengage.com) covering 30+ business platforms including Brevo, Mailchimp, ActiveCampaign, HubSpot, and more.
 
 ---
 
-**Questions?** Open an issue or join our [Discord community](https://discord.gg/mcpengine).
+**Questions?** Open an issue or join our [Discord community](https://discord.gg/mcpengage).
diff --git a/package.json b/package.json
index f0a3cc8..342fc6f 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "MCP server for Constant Contact API - 2026 Complete Version",
   "type": "module",
   "main": "dist/index.js",
-  "author": "MCPEngine <hello@mcpengage.com>",
+  "author": "MCPEngage <hello@mcpengage.com>",
   "license": "MIT",
   "repository": {
     "type": "git",