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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a WordPress plugin for integrating Twilio functionality. The plugin is in early development stage.
+
+## WordPress Plugin Development Structure
+
+When developing this plugin, follow WordPress plugin conventions:
+- Main plugin file should be in the root directory (e.g., `twilio-wp-plugin.php`)
+- Use `includes/` directory for PHP class files and core functionality
+- Use `admin/` directory for admin-specific functionality
+- Use `public/` directory for frontend functionality
+- Use `assets/` directory for CSS, JS, and image files
+
+## Development Commands
+
+Since this is a WordPress plugin, typical commands include:
+
+```bash
+# Install WordPress development dependencies (if using Composer)
+composer install
+
+# Install JavaScript dependencies (if using npm)
+npm install
+
+# Build assets (if using build tools)
+npm run build
+
+# Run PHP CodeSniffer for WordPress coding standards
+vendor/bin/phpcs
+
+# Fix PHP coding standards automatically
+vendor/bin/phpcbf
+
+# Run PHPUnit tests
+vendor/bin/phpunit
+```
+
+## Key WordPress Plugin Conventions
+
+- Use WordPress hooks and filters system for extending functionality
+- Follow WordPress coding standards for PHP, JavaScript, and CSS
+- Prefix all functions, classes, and global variables with plugin-specific prefix to avoid conflicts
+- Use WordPress's built-in functions for database operations, HTTP requests, and sanitization
+- Store Twilio API credentials using WordPress options API with encryption
+
+## Twilio Integration Points
+
+When working with Twilio API:
+- Store API credentials securely in WordPress options
+- Use WordPress's `wp_remote_post()` and `wp_remote_get()` for API calls
+- Implement proper error handling and logging using WordPress error logging
+- Consider rate limiting and webhook verification for security
+
+## Testing Approach
+
+- Use PHPUnit for unit testing PHP code
+- Mock WordPress functions using Brain Monkey or WP_Mock
+- Test Twilio API interactions using mock responses
+- Use WordPress testing framework for integration tests