fix request signing for GET requests with empty payload

Author: matthiez

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 the **seven.io PHP SDK**, an official API client for the seven.io SMS Gateway API. It's a PHP library that provides a clean, object-oriented interface for all seven.io services including SMS, Voice, RCS messaging, number lookup, and analytics.
+
+## Development Commands
+
+### Testing
+```bash
+# Run all tests with production API key
+SEVEN_API_KEY=your_api_key php vendor/bin/phpunit tests
+
+# Run all tests with sandbox API key (preferred for development)
+SEVEN_API_KEY_SANDBOX=your_sandbox_key php vendor/bin/phpunit tests
+
+# Run specific test file
+php vendor/bin/phpunit tests/SmsTest.php
+
+# Run tests with verbose output
+php vendor/bin/phpunit tests --verbose
+```
+
+### Documentation Generation
+```bash
+# Generate API documentation (outputs to docs/ directory)
+php vendor/bin/phpdoc
+```
+
+### Package Management
+```bash
+# Install dependencies
+composer install
+
+# Install without dev dependencies
+composer install --no-dev
+
+# Update dependencies
+composer update
+```
+
+## Architecture Overview
+
+### Core Components
+
+1. **Client (`src/Client.php`)** - The main HTTP client that handles all API communication
+   - Manages authentication via API keys and optional signing secrets
+   - Handles all HTTP methods (GET, POST, PATCH, DELETE)
+   - Implements request signing for webhook verification
+   - Manages error handling and exception throwing
+
+2. **Resources** - Each API endpoint group has its own resource class
+   - All extend `src/Resource/Resource.php` abstract class
+   - Located in `src/Resource/*/` directories (Analytics, Sms, Voice, etc.)
+   - Each resource handles specific API functionality (SMS sending, lookups, etc.)
+
+3. **Parameter Objects** - Type-safe parameter classes for API requests
+   - Follow naming pattern: `*Params.php` (e.g., `SmsParams`, `VoiceParams`)
+   - Implement validation and provide fluent interfaces
+
+4. **Response Objects** - Structured response classes for API responses
+   - Located alongside their respective resources
+   - Provide type-safe access to response data
+
+### Directory Structure
+
+```
+src/
+├── Client.php                    # Main HTTP client
+├── Exception/                    # Custom exception classes
+├── Library/                      # Shared utilities and enums
+└── Resource/                     # API resource implementations
+    ├── Resource.php              # Abstract base class
+    ├── Analytics/                # Analytics and reporting
+    ├── Balance/                  # Account balance
+    ├── Contacts/                 # Contact management
+    ├── Groups/                   # Contact groups
+    ├── Hooks/                    # Webhook management
+    ├── Journal/                  # Message history
+    ├── Lookup/                   # Number lookup/validation
+    ├── Numbers/                  # Phone number management
+    ├── Pricing/                  # Pricing information
+    ├── Rcs/                      # RCS messaging
+    ├── Sms/                      # SMS messaging (primary feature)
+    ├── Status/                   # Delivery status
+    ├── Subaccounts/              # Subaccount management
+    ├── ValidateForVoice/         # Voice validation
+    └── Voice/                    # Voice calls
+```
+
+### Key Design Patterns
+
+1. **Resource Pattern** - Each API endpoint group is encapsulated in a Resource class
+2. **Parameter Objects** - Request parameters are wrapped in typed parameter objects
+3. **Exception Hierarchy** - Custom exceptions for different API error types
+4. **Client Composition** - Resources receive the Client instance for HTTP operations
+
+## Testing Environment
+
+### Environment Variables
+- `SEVEN_API_KEY` - Production API key for live testing
+- `SEVEN_API_KEY_SANDBOX` - Sandbox API key for safe testing (preferred)
+- `SEVEN_SIGNING_SECRET` - Optional webhook signing secret
+
+### Test Structure
+- All tests extend `tests/BaseTest.php`
+- Uses `tests/Resources.php` as a resource factory for consistent test setup
+- Tests are organized by resource type (SmsTest.php, VoiceTest.php, etc.)
+- Tests can switch between production and sandbox environments
+
+## Common Development Patterns
+
+### Creating a New Resource
+1. Create resource class extending `Resource` in appropriate namespace
+2. Create parameter classes implementing `ParamsInterface`
+3. Create response/data classes for API responses
+4. Add validator classes if complex validation is needed
+5. Add corresponding test class extending `BaseTest`
+
+### Exception Handling
+The client automatically handles API error codes:
+- `900` - Invalid API Key
+- `901` - Signing Hash Verification Failed
+- `902` - Missing Access Rights
+- `903` - Forbidden IP
+- `600` - General API Error
+
+### Request Authentication
+The Client supports two authentication methods:
+1. API Key only (standard)
+2. API Key + Signing Secret (for webhook verification)
+
+## Requirements
+
+- PHP 8.2+
+- Required extensions: curl, json, mbstring, ctype
+- Development extensions: xdebug, soap, simplexml

docs/Deprecated.md

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+**Navigation**
+
+`No deprecated elements have been found in this project.`
+
+***
+[\\](Home) » Deprecated elements

docs/Errors.md

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+**Navigation**
+
+`No errors have been found in this project.`
+
+
+***
+[\\](Home) » Compilation errors

docs/Graphs.md

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+## Class Hierarchy Diagram
+
+![Class hierarchy diagram](wiki/images/classes.svg)
+
+***
+[\\](Home) » Graphs