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+# WhatsApp Templates in Chatwoot
+
+Chatwoot supports WhatsApp message templates for outbound messaging via the WhatsApp Business Platform.
+
+📘 **Reference**: Meta Docs – [Message Templates](https://developers.facebook.com/docs/whatsapp/business-management-api/message-templates)
+
+## Overview
+
+WhatsApp Business API requires pre-approved message templates for initiating conversations with customers. Chatwoot provides support for creating and sending various types of templates while maintaining compliance with WhatsApp's template policies.
+
+## ✅ What is Supported
+
+### Template Categories
+
+- **UTILITY** - Transactional messages (order confirmations, receipts, etc.)
+- **MARKETING** - Promotional content and offers
+- **AUTHENTICATION** - OTP codes and verification messages with automatic button parameter population
+- **SHIPPING_UPDATE** - Package and delivery status updates
+- **TICKET_UPDATE** - Support ticket notifications
+- **ISSUE_RESOLUTION** - Customer service follow-ups
+
+### Template Components
+
+#### Headers
+
+- **TEXT** - Plain text headers with variable placeholders ({{1}}, {{2}}, etc.)
+- **IMAGE** - Image headers with media URL parameters (JPEG, PNG)
+- **VIDEO** - Video headers with media URL parameters (MP4, 3GPP)
+- **DOCUMENT** - Document headers with file URL parameters (PDF, DOC, DOCX, XLS, XLSX, PPT, PPTX, TXT)
+- **None** - Templates without headers
+
+#### Body (Required)
+
+- **TEXT** - Always required component that supports:
+  - Static text content
+  - Variable placeholders ({{1}}, {{2}}, etc.)
+  - Special authentication parameters (OTP codes, expiry times)
+  - Rich text formatting preservation
+
+#### Footer (Optional)
+
+- **TEXT** - Plain text footers with variable support
+
+#### Buttons (Optional)
+
+- **URL** - Call-to-action buttons with dynamic URLs and variable parameters
+- **PHONE_NUMBER** - Click-to-call buttons
+- **COPY_CODE** - Coupon/discount code buttons (max 15 characters)
+- **QUICK_REPLY** - Interactive reply buttons for user responses
+
+### Special Template Types
+
+#### Authentication Templates
+
+- **OTP Templates**: Automatic OTP code and expiry time parameter handling
+- **Button Auto-population**: URL buttons automatically populated with OTP codes
+- **Enhanced Validation**: OTP codes (4-8 digits), expiry times validation
+- **Structured Parameters**: Organized body and button parameter processing
+
+#### Media Templates
+
+- **Image Templates**: Full support for JPEG, PNG formats with URL validation
+- **Video Templates**: Full support for MP4, 3GPP formats with URL validation
+- **Document Templates**: **NEW** - Full support for PDF, Office documents, and text files
+- **URL Validation**: Comprehensive validation, sanitization, and accessibility checks
+- **Media Parameter Building**: Proper WhatsApp API format generation
+
+## 🔄 Supported Template Combinations
+
+### Basic Templates
+
+1. **Text Only**: Body component only
+2. **Text + Footer**: Body with footer text
+3. **Text Header + Body**: Text header with body content
+4. **Text Header + Body + Footer**: Full text template with all components
+
+### Media Templates
+
+5. **Image Header + Body**: Image with descriptive text
+6. **Image Header + Body + Footer**: Image template with footer
+7. **Video Header + Body**: Video with descriptive text
+8. **Document Header + Body**: **NEW** - Document with description (PDFs, Office docs, etc.)
+9. **Media + Buttons**: Any media header with action buttons
+
+### Button Templates
+
+10. **Body + URL Button**: Text with call-to-action and dynamic URLs
+11. **Body + Phone Button**: Text with click-to-call
+12. **Body + Copy Code**: Text with coupon code validation
+13. **Body + Quick Reply Button**: Text with interactive reply buttons
+14. **Authentication + URL Button**: OTP templates with auto-populated button parameters
+
+### Authentication Templates
+
+15. **OTP Template**: Body with OTP code and expiry with enhanced processing
+16. **OTP + Footer**: OTP template with footer text
+17. **OTP + URL Buttons**: **NEW** - OTP template with auto-populated action buttons
+
+## ❌ What is Not Supported
+
+### Interactive Components
+
+- **LIST** templates with selectable options
+- **PRODUCT** templates with catalog integration
+- **CATALOG** templates for product browsing
+- **Multi-select** components
+
+### Location Components
+
+- **LOCATION** headers with map coordinates
+- **Address** parameters with latitude/longitude
+- **Location-based** templates
+
+### Advanced Features
+
+- **Rich text formatting** in template creation (preserved in sending)
+- **Carousel** templates with multiple cards
+- **Form** components for data collection
+- **Payment** integration templates
+- **Flow** templates with conditional logic
+
+### Limitations
+
+- **Button limit**: Maximum 3 buttons per template
+- **Variable limit**: Maximum 10 variables per component
+- **Character limits**: Per WhatsApp Business API restrictions
+- **Media size limits**: Documents < 100MB, Images < 5MB, Videos < 16MB
+
+## 🚀 Using Templates in Chatwoot
+
+### Template Creation
+
+1. Create templates through WhatsApp Business Manager
+2. Ensure templates are in **approved** status
+3. Templates will automatically/manually sync to Chatwoot
+4. Unsupported template types are automatically filtered out
+
+### Sending Templates
+
+#### Legacy Template Interface (Current)
+
+1. **Select Template**: Choose from approved templates in the picker
+2. **Fill Parameters**:
+   - **Media URLs**: For image/video/document headers (must be publicly accessible)
+   - **Body Variables**: Text values for {{1}}, {{2}}, etc. placeholders
+   - **Button Parameters**: Dynamic values for URL buttons and copy codes
+   - **Authentication Values**: OTP codes with automatic validation
+
+### Parameter Validation & Processing
+
+#### Frontend Processing
+
+- **Variable Detection**: Automatic parsing of {{}} placeholders
+- **Parameter Organization**: Structured grouping by component type
+- **Validation Rules**: Real-time validation with user feedback
+- **Special Handling**: Authentication template auto-population
+
+#### Backend Processing
+
+- **Enhanced Template Processing**: Handles structured parameter format
+- **Media Parameter Building**: Generates proper WhatsApp API media objects
+- **Authentication Support**: Auto-populates button parameters with OTP values
+- **URL Validation**: Comprehensive accessibility and format checking
+
+## 🔧 Technical Implementation
+
+### Frontend Architecture
+
+#### Components
+
+- **TemplatesPicker.vue**: Template selection with filtering for supported types
+- **TemplateParser.vue**: **Enhanced** - Parameter input with structured processing
+  - Media URL input for IMAGE/VIDEO/DOCUMENT headers
+  - Body parameter handling with authentication special cases
+  - Button parameter processing with auto-population
+  - Enhanced validation and error handling
+
+#### TODO: 
+- Add support all the advanced template types for new Conversation templates
+- Add support for all the advanced template types for WhatsApp Campaigns
+
+### Backend Architecture
+
+#### Core Service
+
+- **TemplateProcessorService**: Main processing engine with multiple pathways:
+  - **Enhanced Processing**: For structured parameters (header/body/buttons)
+  - **Legacy Processing**: For simple text-only templates
+  - **Authentication Processing**: Special handling for OTP templates
+  - **Media Processing**: Dedicated handling for IMAGE/VIDEO/DOCUMENT templates
+
+#### Processing Flow
+
+```ruby
+# 1. Parameter Routing
+if structured_params?(header/body/buttons)
+  process_enhanced_template_params()
+else
+  # Legacy processing for simple templates
+  process_legacy_template_params()
+end
+
+2. Component Building
+- Header: Media parameter generation
+- Body: Text parameter processing
+- Buttons: URL/copy_code parameter handling
+
+3. WhatsApp API Formatting
+Convert to proper WhatsApp Cloud API structure
+```
+
+#### Media Parameter Handling
+
+- **URL Validation**: Scheme, accessibility, format checking
+- **Media Type Detection**: Automatic format detection and validation
+- **Parameter Building**: Generates proper WhatsApp media objects
+- **Error Handling**: Comprehensive validation with helpful error messages
+
+### API Integration
+
+- **WhatsApp Cloud API**: Primary integration for template sending
+- **Template Sync**: Automatic synchronization of approved templates with filtering
+- **Parameter Formatting**: Converts Chatwoot structured parameters to WhatsApp format
+- **Error Handling**: Validates parameters and provides detailed error feedback
+
+## 📋 Best Practices
+
+### Template Design
+
+- Keep message content **clear and concise**
+- Use **meaningful variable names** for better organization
+- Test templates thoroughly before approval
+- Follow WhatsApp's **template policies** and guidelines
+
+### Parameter Management
+
+- **Media URLs**: Use publicly accessible URLs (avoid temporary/auth-required URLs)
+  - ✅ `https://your-domain.com/files/document.pdf`
+  - ❌ `https://scontent.whatsapp.net/...` (temporary WhatsApp URLs)
+- **Authentication Templates**: Let system auto-populate button parameters
+- **Validation**: Always validate parameters before sending
+- **Error Handling**: Implement proper error handling for failed parameters
+
+### Media Best Practices
+
+- **Documents**: Use direct download URLs, ensure < 100MB file size
+- **Images**: Optimize for mobile viewing, ensure < 5MB file size
+- **Videos**: Keep under 16MB, use MP4 format for best compatibility
+- **Accessibility**: Ensure all media URLs are publicly accessible without authentication
+
+### Compliance
+
+- Ensure all templates are **properly approved** before use
+- Follow **opt-in requirements** for marketing templates
+- Respect **rate limits** and sending windows
+- Monitor **template quality ratings** and compliance metrics
+
+## 🆘 Troubleshooting
+
+### Common Issues
+
+#### Template Issues
+
+- **Template not appearing**: Check approval status and supported format
+- **Interactive templates missing**: LIST/PRODUCT/CATALOG templates are not supported
+- **Location templates missing**: LOCATION templates are not supported
+
+#### Parameter Issues
+
+- **Parameter validation errors**: Verify required fields are filled
+- **Media loading failures**: Ensure URLs are publicly accessible and valid format
+- **Button parameters empty**: Check auto-population for authentication templates
+
+#### Sending Failures
+
+- **Format mismatch errors**: Verify template structure matches expected format
+- **Media upload errors (131053)**: Check media URL accessibility and file size
+- **Missing parameter errors**: Ensure all required template variables are filled
+
+### Error Messages & Solutions
+
+#### Media Errors
+
+- `Media upload error (131053)`:
+  - **Cause**: URL not accessible, file too large, or unsupported format
+  - **Solution**: Use publicly accessible URLs, check file size limits
+
+#### Parameter Errors
+
+- `Required parameter is missing`:
+  - **Cause**: Template variables not filled or button parameters missing
+  - **Solution**: Fill all required fields, check authentication auto-population
+
+#### Template Errors
+
+- `Template not found`: Template may not be approved or synced
+- `Invalid parameter format`: Check variable formatting and requirements
+- `OTP validation failed`: Ensure OTP is 4-8 digits numeric only
+
+### Debugging Support
+
+- Check WhatsApp Business Manager for template approval status
+- Verify template compliance with supported component types
+- Review parameter structure and validation requirements
+- Check media URL accessibility independently
+- Monitor Rails logs for detailed error information
+
+## 📈 Future Roadmap & TODOs
+
+### Future Enhancements
+
+While Chatwoot currently provides comprehensive core template functionality, potential future improvements include:
+
+- **Rich text formatting** support in template creation
+- **Enhanced media validation** with format conversion
+- **Template performance analytics** and usage metrics
+- **Advanced parameter management** with preset values
+- **Custom template validation rules** and business logic
+- **Template testing environment** for development
+- **Media asset management** with CDN integration
+
+### Integration Improvements
+
+- **Webhook support** for template status changes
+- **Advanced error handling** with retry mechanisms
+- **Template versioning** and rollback capabilities
+- **Multi-language template** management
+- **Template approval workflow** integration
+
+
+### QA Checklist
+
+**Complete Template Coverage: 16 Templates covering all 17 Supported Combinations**
+
+| Template Name | Category | Header | Buttons | Template Type | Coverage |
+| --- | --- | --- | --- | --- | --- |
+| greet | MARKETING | None | None | Text Only | ✅ |
+| delivery_confirmation | UTILITY | None | None | Text Only | ✅ |
+| hello_world | UTILITY | TEXT | None | Text Header + Body + Footer | ✅ |
+| address_update | UTILITY | TEXT | None | Text Header + Body | ✅ |
+| order_confirmation | MARKETING | IMAGE | None | Image Header + Body | ✅ |
+| product_launch | MARKETING | IMAGE | None | Image Header + Body + Footer | ✅ |
+| training_video | MARKETING | VIDEO | None | Video Header + Body | ✅ |
+| purchase_receipt | UTILITY | DOCUMENT | None | Document Header + Body | ✅ |
+| event_invitation | MARKETING | IMAGE | URL, URL | Media + Buttons | ✅ |
+| track_order | UTILITY | None | URL | Body + URL Button | ✅ |
+| support_callback | UTILITY | None | PHONE_NUMBER | Body + Phone Button | ✅ |
+| discount_coupon | MARKETING | None | COPY_CODE | Body + Copy Code | ✅ |
+| technician_visit | UTILITY | TEXT | QUICK_REPLY, QUICK_REPLY | Body + Quick Reply Button | ✅ |
+| basic_otp | AUTHENTICATION | None | URL (Copy Code) | Basic OTP Template | ✅ |
+| otp_verification | AUTHENTICATION | None | URL (Copy Code) | Authentication + URL Button | ✅ |
+| secure_login_otp | AUTHENTICATION | None | URL (Zero-tap) | OTP + Footer + Zero-tap | ✅ |
+
+**Summary:**
+- **Total Templates**: 16
+- **Template Combinations Covered**: 17/17 (100%)
+- **Authentication Methods**: Copy Code, Zero-tap Auto-fill
+- **Media Types**: TEXT, IMAGE, VIDEO, DOCUMENT
+- **Button Types**: URL, PHONE_NUMBER, COPY_CODE, QUICK_REPLY
+- **Parameter Formats**: NAMED, POSITIONAL
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