🐛 Critical Bug Fixes #

URL Construction Fix

• Fixed HTTP 400 errors - Resolved incorrect API endpoint URL construction that was causing all message sending to fail
• Proper slash handling - Added missing leading slashes to all API endpoints to ensure correct URL formation
• Fixed endpoints affected:
  • Message Service: All message sending methods (text, media, templates, reactions, etc.)
  • Media Service: Media upload and URL-based media sending
  • Template Service: Template creation, retrieval, and management
• Before: https://graph.facebook.com/v16.0111605711818262/messages ❌
• After: https://graph.facebook.com/v16.0/111605711818262/messages ✅

Impact

• Resolves all HTTP 400 "Client error" responses when sending messages
• Fixes WhatsApp Cloud API communication for all package functionality
• No breaking changes - existing code will work immediately after update

🔧 Technical Details #

• Updated endpoint construction in MessageService, MediaService, and TemplateService
• Removed duplicate API version prefixes in template endpoints
• Ensured consistent URL formatting across all services

📚 Documentation Improvements #

Enhanced Example Code

• Complete webhook server example - Added full webhook server implementation as commented code in example/lib/main.dart
• Copy-paste ready code - Users can now easily copy the complete working webhook server from the example
• Detailed setup instructions - Step-by-step guide for running webhook servers in pure Dart environments
• Production-ready template - Includes CORS, error handling, auto-reply functionality, and proper logging

Developer Experience

• Improved accessibility - Webhook server code now available in both standalone file and commented in main example
• Clear documentation - Better explanation of server vs Flutter client differences
• Setup guidance - Complete instructions for ngrok, Meta Developer Console configuration

🔧 Bug Fixes #

Server Compatibility

• Fixed Flutter UI dependency issue - Resolved "dart:ui library is not available on this platform" error when running webhook servers in pure Dart environments
• Added server-compatible exports - Created whatsapp_cloud_server.dart library export that excludes Flutter UI dependencies
• Server-only authentication manager - Implemented ServerAuthManager with in-memory token storage to replace SharedPreferences in server environments
• Pure Dart client implementation - Added WhatsAppCloudServerClient for server-side WhatsApp API integration without Flutter dependencies

Architecture Improvements

• Introduced authentication interface - Created AuthManagerInterface to allow both Flutter and server authentication managers
• Dependency isolation - Separated Flutter-specific imports from core API functionality
• Improved import structure - Cleaned up service imports to avoid circular dependencies with Flutter UI components

🚀 New Features #

• Server webhook example - Added webhook_server_simple.dart with production-ready server implementation
• In-memory token storage - Server-compatible token storage that doesn't require Flutter's SharedPreferences
• Simplified server setup - One-step server client creation for webhook implementations

📚 Documentation Updates #

• Updated webhook server examples to use server-compatible client
• Added server deployment guidance
• Clarified Flutter vs pure Dart environment requirements

🚀 Major Documentation & Integration Update #

This release significantly improves the developer experience with comprehensive implementation guides and production-ready examples.

✨ Features Added #

Complete Implementation Guides

• Webhook Server Implementation - Production-ready webhook server with auto-reply functionality
• Media Upload Examples - Complete integration with Flutter's image_picker and file_picker
• Template Management Guide - Step-by-step template creation and approval workflow
• First-Time User Setup - Comprehensive checklist and troubleshooting guide

Enhanced Example Application

• Detailed Code Comments - Complete implementation examples in comments
• Webhook Server Example - Ready-to-run webhook server (webhook_server.dart)
• Media Upload Integration - Working examples for camera, gallery, and file uploads
• Template Usage Examples - Business template implementation patterns
• Enhanced Documentation - Complete setup guide for new users

Developer Experience Improvements

• README Enhancement - Added collapsible implementation guides
• Example README - Complete first-time user guide with troubleshooting
• Dependency Management - Clear optional dependencies with usage instructions
• Setup Checklists - Step-by-step validation for all features

Production Ready Components

• Complete Webhook Server - CORS support, error handling, auto-replies
• Security Best Practices - Token management, input validation, webhook verification
• Configuration Examples - Development vs production environment setup
• Debugging Tools - Enhanced logging and error reporting

📚 Documentation Improvements #

• Complete webhook server implementation with setup instructions
• Media upload integration with Flutter image picker
• Template management workflow with Meta Business Manager
• First-time setup checklist with common issues and solutions
• Production deployment security guidelines
• Enhanced troubleshooting section with solutions

🔧 Developer Tools #

• Production-ready webhook server example
• Media upload manager with multiple sources (camera, gallery, files, URLs)
• Template manager with approval workflow
• Configuration examples for different environments
• Debugging utilities and logging enhancements

📱 Example Application Updates #

• Enhanced UI with better user experience
• Complete implementation examples in comments
• Optional dependency management
• Step-by-step setup instructions
• Real-world usage patterns

🎉 Initial Release #

The first stable release of WhatsApp Cloud Flutter package, providing comprehensive WhatsApp Cloud API integration for Flutter applications.

✨ Features Added #

Core Functionality

• WhatsApp Cloud Client - Complete client implementation with configuration options
• Authentication Management - Secure token handling and validation
• Environment Configuration - Support for production and sandbox environments
• Comprehensive Error Handling - Specific exception types for different error scenarios

Message Services

• Text Messages - Send rich text messages with URL preview support
• Media Messages - Support for images, videos, audio, documents, and stickers
• Interactive Messages - Button and list-based interactive messages
• Advanced Interactive Messages - CTA URLs, location requests, address collection
• Location Messages - Send GPS coordinates with names and addresses
• Contact Messages - Share vCard format contact information
• Template Messages - Business template support with dynamic parameters
• Reaction Messages - Emoji reactions to messages
• Message Status Tracking - Mark messages as read, track delivery status

Advanced Features

• Rate Limiting - Built-in protection against API quota violations
• Retry Mechanism - Automatic retry with exponential backoff
• Comprehensive Logging - Multi-level logging for debugging and monitoring
• Analytics Integration - Performance metrics and usage analytics
• Security Features - Input validation, webhook signature verification
• Webhook Integration - Complete webhook handling for real-time events

Flutter UI Components

• MessageComposer - Ready-to-use message input widget
• TemplateSelector - Template picker with preview functionality
• ChatBubble - Customizable message bubble widget

Developer Experience

• Type Safety - Full type safety for all API interactions
• Comprehensive Documentation - Detailed API documentation and examples
• Example Application - Complete working example demonstrating all features
• Unit Tests - Comprehensive test coverage

📚 Documentation & Examples #

• Complete README with step-by-step usage guide
• API reference documentation
• Production deployment security checklist
• Comprehensive example application
• Contributing guidelines

🛡️ Security & Production Ready #

• Webhook signature verification
• Secure token management
• Input validation and sanitization
• Comprehensive error handling
• Rate limiting protection

📊 Platform Support #

• Android, iOS, Web, Windows, macOS, Linux

Author: Israel Biselu from SwahiliConnect
License: MIT License