Implement version 0.0.9 features

- Add API client examples for PHP, Python, JavaScript, curl, and C#
- Create comprehensive REST API documentation in docs/client-examples/
- All examples include rate limit handling (HTTP 429)
- Examples cover validate, status, and activate endpoints

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -34,13 +34,7 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 ### Known Bugs
 
-_No known bugs at this time._
-
-### Version 0.0.9
-
-
-
-**Note for AI Assistants:** Cleanup the versions in this section after implementation, but keep this notice!
+_No known bugs at this time.
 
 ## Technical Stack
 
@@ -462,3 +456,27 @@ Full API documentation available in `openapi.json` (OpenAPI 3.1 specification).
 - Admins can customize subject, heading, additional content, and enable/disable via WC settings
 - Expiration warning schedule (days before) remains in plugin settings
 - Email enable/disable is controlled through WooCommerce email settings
+
+### 2026-01-21 - Version 0.0.9 Features
+
+**Implemented:**
+
+- Created API client examples for multiple programming languages
+- Documentation for REST API usage with code examples
+
+**New files:**
+
+- `docs/client-examples/README.md` - API documentation and overview
+- `docs/client-examples/curl.sh` - cURL command examples
+- `docs/client-examples/php-client.php` - PHP client class with examples
+- `docs/client-examples/python-client.py` - Python client class with examples
+- `docs/client-examples/javascript-client.js` - JavaScript/Node.js client class
+- `docs/client-examples/csharp-client.cs` - C# client class with examples
+
+**Technical notes:**
+
+- All client examples include error handling for rate limiting (HTTP 429)
+- Examples demonstrate all three API endpoints: validate, status, activate
+- JavaScript client works in both browser and Node.js environments
+- Python client uses dataclasses for type-safe responses
+- C# client uses async/await patterns and System.Text.Json

docs/client-examples/README.md

@@ -0,0 +1,69 @@
+# WC Licensed Product API Client Examples
+
+This directory contains example API clients for integrating with the WC Licensed Product REST API.
+
+## API Base URL
+
+```shell
+https://your-site.com/wp-json/wc-licensed-product/v1
+```
+
+## Available Endpoints
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/validate` | POST | Validate a license key for a specific domain |
+| `/status` | POST | Get the current status of a license |
+| `/activate` | POST | Activate a license on a domain |
+
+## Rate Limiting
+
+The API is rate-limited to 30 requests per minute per IP address. If you exceed this limit, you'll receive a `429 Too Many Requests` response with a `Retry-After` header indicating when you can retry.
+
+## Example Files
+
+- [curl.sh](curl.sh) - cURL command examples
+- [php-client.php](php-client.php) - PHP client class
+- [python-client.py](python-client.py) - Python client class
+- [javascript-client.js](javascript-client.js) - JavaScript/Node.js client class
+- [csharp-client.cs](csharp-client.cs) - C# client class
+
+## Response Format
+
+All endpoints return JSON responses with the following structure:
+
+### Success Response (Validate)
+
+```json
+{
+    "valid": true,
+    "license": {
+        "status": "active",
+        "domain": "example.com",
+        "expires_at": "2025-12-31",
+        "product_id": 123
+    }
+}
+```
+
+### Error Response
+
+```json
+{
+    "valid": false,
+    "error": "license_not_found",
+    "message": "License key not found."
+}
+```
+
+## Error Codes
+
+| Code | Description |
+| ------ | ------------- |
+| `license_not_found` | The license key does not exist |
+| `license_expired` | The license has expired |
+| `license_revoked` | The license has been revoked |
+| `license_inactive` | The license is inactive |
+| `domain_mismatch` | The license is not valid for the provided domain |
+| `max_activations_reached` | Maximum number of domain activations reached |
+| `rate_limit_exceeded` | Too many requests, please wait and retry |

docs/client-examples/csharp-client.cs

@@ -0,0 +1,352 @@
+/**
+ * WC Licensed Product API Client for C#
+ *
+ * A C# client for interacting with the WC Licensed Product REST API.
+ *
+ * Requirements:
+ *   - .NET 6.0+ or .NET Framework 4.7.2+
+ *   - System.Net.Http
+ *   - System.Text.Json (or Newtonsoft.Json)
+ *
+ * Usage:
+ *   var client = new WcLicensedProductClient("https://your-site.com");
+ *   var result = await client.ValidateAsync("XXXX-XXXX-XXXX-XXXX", "example.com");
+ */
+
+using System;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using System.Threading.Tasks;
+
+namespace WcLicensedProduct
+{
+    /// <summary>
+    /// License status response data
+    /// </summary>
+    public class LicenseStatus
+    {
+        [JsonPropertyName("valid")]
+        public bool Valid { get; set; }
+
+        [JsonPropertyName("status")]
+        public string Status { get; set; }
+
+        [JsonPropertyName("domain")]
+        public string Domain { get; set; }
+
+        [JsonPropertyName("expires_at")]
+        public string ExpiresAt { get; set; }
+
+        [JsonPropertyName("activations_count")]
+        public int ActivationsCount { get; set; }
+
+        [JsonPropertyName("max_activations")]
+        public int MaxActivations { get; set; }
+    }
+
+    /// <summary>
+    /// Validation response data
+    /// </summary>
+    public class ValidationResult
+    {
+        [JsonPropertyName("valid")]
+        public bool Valid { get; set; }
+
+        [JsonPropertyName("error")]
+        public string Error { get; set; }
+
+        [JsonPropertyName("message")]
+        public string Message { get; set; }
+
+        [JsonPropertyName("license")]
+        public LicenseInfo License { get; set; }
+    }
+
+    /// <summary>
+    /// License information in validation response
+    /// </summary>
+    public class LicenseInfo
+    {
+        [JsonPropertyName("status")]
+        public string Status { get; set; }
+
+        [JsonPropertyName("domain")]
+        public string Domain { get; set; }
+
+        [JsonPropertyName("expires_at")]
+        public string ExpiresAt { get; set; }
+
+        [JsonPropertyName("product_id")]
+        public int ProductId { get; set; }
+    }
+
+    /// <summary>
+    /// Activation response data
+    /// </summary>
+    public class ActivationResult
+    {
+        [JsonPropertyName("success")]
+        public bool Success { get; set; }
+
+        [JsonPropertyName("error")]
+        public string Error { get; set; }
+
+        [JsonPropertyName("message")]
+        public string Message { get; set; }
+    }
+
+    /// <summary>
+    /// Exception for API errors
+    /// </summary>
+    public class WcLicensedProductException : Exception
+    {
+        public string ErrorCode { get; }
+        public int HttpCode { get; }
+
+        public WcLicensedProductException(string message, string errorCode = null, int httpCode = 0)
+            : base(message)
+        {
+            ErrorCode = errorCode;
+            HttpCode = httpCode;
+        }
+    }
+
+    /// <summary>
+    /// Exception for rate limit errors
+    /// </summary>
+    public class RateLimitException : WcLicensedProductException
+    {
+        public int RetryAfter { get; }
+
+        public RateLimitException(int retryAfter)
+            : base($"Rate limit exceeded. Retry after {retryAfter} seconds.")
+        {
+            RetryAfter = retryAfter;
+        }
+    }
+
+    /// <summary>
+    /// Client for the WC Licensed Product REST API
+    /// </summary>
+    public class WcLicensedProductClient : IDisposable
+    {
+        private readonly HttpClient _httpClient;
+        private readonly string _baseUrl;
+        private readonly JsonSerializerOptions _jsonOptions;
+
+        /// <summary>
+        /// Initialize the client
+        /// </summary>
+        /// <param name="siteUrl">Your WordPress site URL (e.g., "https://example.com")</param>
+        /// <param name="timeout">Request timeout (default: 30 seconds)</param>
+        public WcLicensedProductClient(string siteUrl, TimeSpan? timeout = null)
+        {
+            _baseUrl = siteUrl.TrimEnd('/') + "/wp-json/wc-licensed-product/v1";
+
+            _httpClient = new HttpClient
+            {
+                Timeout = timeout ?? TimeSpan.FromSeconds(30)
+            };
+            _httpClient.DefaultRequestHeaders.Accept.Add(
+                new MediaTypeWithQualityHeaderValue("application/json"));
+
+            _jsonOptions = new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true
+            };
+        }
+
+        /// <summary>
+        /// Validate a license key for a specific domain
+        /// </summary>
+        /// <param name="licenseKey">The license key to validate</param>
+        /// <param name="domain">The domain to validate against</param>
+        /// <returns>Validation result</returns>
+        public async Task<ValidationResult> ValidateAsync(string licenseKey, string domain)
+        {
+            var data = new { license_key = licenseKey, domain = domain };
+            return await RequestAsync<ValidationResult>("/validate", data);
+        }
+
+        /// <summary>
+        /// Get the status of a license
+        /// </summary>
+        /// <param name="licenseKey">The license key to check</param>
+        /// <returns>License status</returns>
+        public async Task<LicenseStatus> StatusAsync(string licenseKey)
+        {
+            var data = new { license_key = licenseKey };
+            return await RequestAsync<LicenseStatus>("/status", data);
+        }
+
+        /// <summary>
+        /// Activate a license on a domain
+        /// </summary>
+        /// <param name="licenseKey">The license key to activate</param>
+        /// <param name="domain">The domain to activate on</param>
+        /// <returns>Activation result</returns>
+        public async Task<ActivationResult> ActivateAsync(string licenseKey, string domain)
+        {
+            var data = new { license_key = licenseKey, domain = domain };
+            return await RequestAsync<ActivationResult>("/activate", data);
+        }
+
+        /// <summary>
+        /// Make an API request
+        /// </summary>
+        private async Task<T> RequestAsync<T>(string endpoint, object data)
+        {
+            var url = _baseUrl + endpoint;
+            var json = JsonSerializer.Serialize(data);
+            var content = new StringContent(json, Encoding.UTF8, "application/json");
+
+            HttpResponseMessage response;
+            try
+            {
+                response = await _httpClient.PostAsync(url, content);
+            }
+            catch (TaskCanceledException)
+            {
+                throw new WcLicensedProductException("Request timeout");
+            }
+            catch (HttpRequestException ex)
+            {
+                throw new WcLicensedProductException($"Request failed: {ex.Message}");
+            }
+
+            // Handle rate limiting
+            if ((int)response.StatusCode == 429)
+            {
+                var retryAfter = 60;
+                if (response.Headers.TryGetValues("Retry-After", out var values))
+                {
+                    int.TryParse(string.Join("", values), out retryAfter);
+                }
+                throw new RateLimitException(retryAfter);
+            }
+
+            var responseBody = await response.Content.ReadAsStringAsync();
+            T result;
+
+            try
+            {
+                result = JsonSerializer.Deserialize<T>(responseBody, _jsonOptions);
+            }
+            catch (JsonException)
+            {
+                throw new WcLicensedProductException("Invalid JSON response");
+            }
+
+            // Check for API errors (for error responses)
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorResult = JsonSerializer.Deserialize<ValidationResult>(responseBody, _jsonOptions);
+                if (errorResult?.Error != null)
+                {
+                    throw new WcLicensedProductException(
+                        errorResult.Message ?? "Unknown error",
+                        errorResult.Error,
+                        (int)response.StatusCode
+                    );
+                }
+            }
+
+            return result;
+        }
+
+        public void Dispose()
+        {
+            _httpClient?.Dispose();
+        }
+    }
+
+    // =========================================================================
+    // Usage Examples
+    // =========================================================================
+
+    public class Program
+    {
+        public static async Task Main(string[] args)
+        {
+            using var client = new WcLicensedProductClient("https://your-wordpress-site.com");
+
+            // Example 1: Validate a license
+            Console.WriteLine("=== Validate License ===");
+            try
+            {
+                var result = await client.ValidateAsync("XXXX-XXXX-XXXX-XXXX", "myapp.example.com");
+
+                if (result.Valid)
+                {
+                    Console.WriteLine("License is valid!");
+                    Console.WriteLine($"Status: {result.License?.Status ?? "active"}");
+                    Console.WriteLine($"Expires: {result.License?.ExpiresAt ?? "Never"}");
+                }
+                else
+                {
+                    Console.WriteLine($"License is not valid: {result.Message ?? "Unknown error"}");
+                }
+            }
+            catch (RateLimitException ex)
+            {
+                Console.WriteLine($"Rate limited. Retry after {ex.RetryAfter} seconds.");
+            }
+            catch (WcLicensedProductException ex)
+            {
+                Console.WriteLine($"Error: {ex.Message}");
+            }
+
+            Console.WriteLine();
+
+            // Example 2: Check license status
+            Console.WriteLine("=== Check License Status ===");
+            try
+            {
+                var status = await client.StatusAsync("XXXX-XXXX-XXXX-XXXX");
+
+                Console.WriteLine($"Valid: {(status.Valid ? "Yes" : "No")}");
+                Console.WriteLine($"Status: {status.Status ?? "unknown"}");
+                Console.WriteLine($"Domain: {status.Domain ?? "None"}");
+                Console.WriteLine($"Expires: {status.ExpiresAt ?? "Never"}");
+                Console.WriteLine($"Activations: {status.ActivationsCount}/{status.MaxActivations}");
+            }
+            catch (RateLimitException ex)
+            {
+                Console.WriteLine($"Rate limited. Retry after {ex.RetryAfter} seconds.");
+            }
+            catch (WcLicensedProductException ex)
+            {
+                Console.WriteLine($"Error: {ex.Message}");
+            }
+
+            Console.WriteLine();
+
+            // Example 3: Activate license on a domain
+            Console.WriteLine("=== Activate License ===");
+            try
+            {
+                var result = await client.ActivateAsync("XXXX-XXXX-XXXX-XXXX", "newsite.example.com");
+
+                if (result.Success)
+                {
+                    Console.WriteLine("License activated successfully!");
+                }
+                else
+                {
+                    Console.WriteLine($"Activation failed: {result.Message ?? "Unknown error"}");
+                }
+            }
+            catch (RateLimitException ex)
+            {
+                Console.WriteLine($"Rate limited. Retry after {ex.RetryAfter} seconds.");
+            }
+            catch (WcLicensedProductException ex)
+            {
+                Console.WriteLine($"Error ({ex.ErrorCode}): {ex.Message}");
+            }
+        }
+    }
+}

docs/client-examples/curl.sh

@@ -0,0 +1,89 @@
+#!/bin/bash
+# WC Licensed Product API - cURL Examples
+#
+# Replace YOUR_SITE_URL with your WordPress site URL
+# Replace YOUR_LICENSE_KEY with your actual license key
+# Replace YOUR_DOMAIN with the domain to validate/activate
+
+BASE_URL="https://YOUR_SITE_URL/wp-json/wc-licensed-product/v1"
+LICENSE_KEY="XXXX-XXXX-XXXX-XXXX"
+DOMAIN="example.com"
+
+# ------------------------------------------------------------------------------
+# Validate License
+# ------------------------------------------------------------------------------
+# Validates if a license key is valid for a specific domain
+# Returns: valid (bool), license details, or error message
+
+echo "=== Validate License ==="
+curl -X POST "${BASE_URL}/validate" \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"license_key\": \"${LICENSE_KEY}\",
+    \"domain\": \"${DOMAIN}\"
+  }"
+echo -e "\n"
+
+# ------------------------------------------------------------------------------
+# Check License Status
+# ------------------------------------------------------------------------------
+# Gets the current status of a license without domain validation
+# Returns: status, domain, expiration date, activation count
+
+echo "=== Check License Status ==="
+curl -X POST "${BASE_URL}/status" \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"license_key\": \"${LICENSE_KEY}\"
+  }"
+echo -e "\n"
+
+# ------------------------------------------------------------------------------
+# Activate License
+# ------------------------------------------------------------------------------
+# Activates a license on a specific domain
+# Returns: success (bool), message
+
+echo "=== Activate License ==="
+curl -X POST "${BASE_URL}/activate" \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"license_key\": \"${LICENSE_KEY}\",
+    \"domain\": \"${DOMAIN}\"
+  }"
+echo -e "\n"
+
+# ------------------------------------------------------------------------------
+# Example with verbose output for debugging
+# ------------------------------------------------------------------------------
+echo "=== Verbose Request (for debugging) ==="
+curl -v -X POST "${BASE_URL}/validate" \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"license_key\": \"${LICENSE_KEY}\",
+    \"domain\": \"${DOMAIN}\"
+  }" 2>&1
+
+# ------------------------------------------------------------------------------
+# Example handling rate limit (429 response)
+# ------------------------------------------------------------------------------
+# The API returns a Retry-After header when rate limited
+# You can use this header to determine when to retry
+
+echo "=== Handling Rate Limits ==="
+response=$(curl -s -w "\n%{http_code}" -X POST "${BASE_URL}/validate" \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"license_key\": \"${LICENSE_KEY}\",
+    \"domain\": \"${DOMAIN}\"
+  }")
+
+http_code=$(echo "$response" | tail -n1)
+body=$(echo "$response" | sed '$d')
+
+if [ "$http_code" == "429" ]; then
+  echo "Rate limited. Please wait before retrying."
+  echo "Response: $body"
+else
+  echo "HTTP $http_code: $body"
+fi

docs/client-examples/javascript-client.js

@@ -0,0 +1,220 @@
+/**
+ * WC Licensed Product API Client for JavaScript
+ *
+ * A JavaScript client for interacting with the WC Licensed Product REST API.
+ * Works in both browser and Node.js environments.
+ *
+ * Browser usage:
+ *   <script src="javascript-client.js"></script>
+ *   const client = new WcLicensedProductClient('https://your-site.com');
+ *   const result = await client.validate('XXXX-XXXX-XXXX-XXXX', 'example.com');
+ *
+ * Node.js usage:
+ *   const WcLicensedProductClient = require('./javascript-client');
+ *   const client = new WcLicensedProductClient('https://your-site.com');
+ */
+
+class WcLicensedProductError extends Error {
+    constructor(message, errorCode = null, httpCode = null) {
+        super(message);
+        this.name = 'WcLicensedProductError';
+        this.errorCode = errorCode;
+        this.httpCode = httpCode;
+    }
+}
+
+class RateLimitError extends WcLicensedProductError {
+    constructor(retryAfter) {
+        super(`Rate limit exceeded. Retry after ${retryAfter} seconds.`);
+        this.name = 'RateLimitError';
+        this.retryAfter = retryAfter;
+    }
+}
+
+class WcLicensedProductClient {
+    /**
+     * Initialize the client
+     * @param {string} siteUrl - Your WordPress site URL (e.g., 'https://example.com')
+     * @param {Object} options - Optional configuration
+     * @param {number} options.timeout - Request timeout in milliseconds (default: 30000)
+     */
+    constructor(siteUrl, options = {}) {
+        this.baseUrl = siteUrl.replace(/\/$/, '') + '/wp-json/wc-licensed-product/v1';
+        this.timeout = options.timeout || 30000;
+    }
+
+    /**
+     * Validate a license key for a specific domain
+     * @param {string} licenseKey - The license key to validate
+     * @param {string} domain - The domain to validate against
+     * @returns {Promise<Object>} Response data with 'valid' boolean and license info
+     */
+    async validate(licenseKey, domain) {
+        return this._request('/validate', {
+            license_key: licenseKey,
+            domain: domain,
+        });
+    }
+
+    /**
+     * Get the status of a license
+     * @param {string} licenseKey - The license key to check
+     * @returns {Promise<Object>} License status data
+     */
+    async status(licenseKey) {
+        return this._request('/status', {
+            license_key: licenseKey,
+        });
+    }
+
+    /**
+     * Activate a license on a domain
+     * @param {string} licenseKey - The license key to activate
+     * @param {string} domain - The domain to activate on
+     * @returns {Promise<Object>} Response with 'success' boolean and message
+     */
+    async activate(licenseKey, domain) {
+        return this._request('/activate', {
+            license_key: licenseKey,
+            domain: domain,
+        });
+    }
+
+    /**
+     * Make an API request
+     * @private
+     * @param {string} endpoint - API endpoint path
+     * @param {Object} data - Request data
+     * @returns {Promise<Object>} Decoded response data
+     */
+    async _request(endpoint, data) {
+        const url = this.baseUrl + endpoint;
+
+        const controller = new AbortController();
+        const timeoutId = setTimeout(() => controller.abort(), this.timeout);
+
+        try {
+            const response = await fetch(url, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                    'Accept': 'application/json',
+                },
+                body: JSON.stringify(data),
+                signal: controller.signal,
+            });
+
+            clearTimeout(timeoutId);
+
+            // Handle rate limiting
+            if (response.status === 429) {
+                const retryAfter = parseInt(response.headers.get('Retry-After') || '60', 10);
+                throw new RateLimitError(retryAfter);
+            }
+
+            const result = await response.json();
+
+            // Check for API errors
+            if (response.status >= 400 && result.error) {
+                throw new WcLicensedProductError(
+                    result.message || 'Unknown error',
+                    result.error,
+                    response.status
+                );
+            }
+
+            return result;
+        } catch (error) {
+            clearTimeout(timeoutId);
+
+            if (error instanceof WcLicensedProductError) {
+                throw error;
+            }
+
+            if (error.name === 'AbortError') {
+                throw new WcLicensedProductError('Request timeout');
+            }
+
+            throw new WcLicensedProductError(`Request failed: ${error.message}`);
+        }
+    }
+}
+
+// =============================================================================
+// Usage Examples
+// =============================================================================
+
+// Example usage (uncomment to run):
+
+/*
+(async () => {
+    const client = new WcLicensedProductClient('https://your-wordpress-site.com');
+
+    // Example 1: Validate a license
+    console.log('=== Validate License ===');
+    try {
+        const result = await client.validate('XXXX-XXXX-XXXX-XXXX', 'myapp.example.com');
+
+        if (result.valid) {
+            console.log('License is valid!');
+            console.log('Status:', result.license?.status || 'active');
+            console.log('Expires:', result.license?.expires_at || 'Never');
+        } else {
+            console.log('License is not valid:', result.message || 'Unknown error');
+        }
+    } catch (error) {
+        if (error instanceof RateLimitError) {
+            console.log(`Rate limited. Retry after ${error.retryAfter} seconds.`);
+        } else {
+            console.log('Error:', error.message);
+        }
+    }
+
+    console.log();
+
+    // Example 2: Check license status
+    console.log('=== Check License Status ===');
+    try {
+        const status = await client.status('XXXX-XXXX-XXXX-XXXX');
+
+        console.log('Valid:', status.valid ? 'Yes' : 'No');
+        console.log('Status:', status.status || 'unknown');
+        console.log('Domain:', status.domain || 'None');
+        console.log('Expires:', status.expires_at || 'Never');
+        console.log('Activations:', `${status.activations_count || 0}/${status.max_activations || 1}`);
+    } catch (error) {
+        if (error instanceof RateLimitError) {
+            console.log(`Rate limited. Retry after ${error.retryAfter} seconds.`);
+        } else {
+            console.log('Error:', error.message);
+        }
+    }
+
+    console.log();
+
+    // Example 3: Activate license on a domain
+    console.log('=== Activate License ===');
+    try {
+        const result = await client.activate('XXXX-XXXX-XXXX-XXXX', 'newsite.example.com');
+
+        if (result.success) {
+            console.log('License activated successfully!');
+        } else {
+            console.log('Activation failed:', result.message || 'Unknown error');
+        }
+    } catch (error) {
+        if (error instanceof RateLimitError) {
+            console.log(`Rate limited. Retry after ${error.retryAfter} seconds.`);
+        } else {
+            console.log(`Error (${error.errorCode}):`, error.message);
+        }
+    }
+})();
+*/
+
+// Export for Node.js
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = WcLicensedProductClient;
+    module.exports.WcLicensedProductError = WcLicensedProductError;
+    module.exports.RateLimitError = RateLimitError;
+}

docs/client-examples/php-client.php

@@ -0,0 +1,188 @@
+<?php
+/**
+ * WC Licensed Product API Client for PHP
+ *
+ * A simple PHP client for interacting with the WC Licensed Product REST API.
+ *
+ * Requirements:
+ * - PHP 7.4+
+ * - cURL extension
+ *
+ * Usage:
+ *   $client = new WcLicensedProductClient('https://your-site.com');
+ *   $result = $client->validate('XXXX-XXXX-XXXX-XXXX', 'example.com');
+ */
+
+class WcLicensedProductClient
+{
+    private string $baseUrl;
+    private int $timeout;
+
+    /**
+     * Constructor
+     *
+     * @param string $siteUrl Your WordPress site URL (e.g., 'https://example.com')
+     * @param int $timeout Request timeout in seconds
+     */
+    public function __construct(string $siteUrl, int $timeout = 30)
+    {
+        $this->baseUrl = rtrim($siteUrl, '/') . '/wp-json/wc-licensed-product/v1';
+        $this->timeout = $timeout;
+    }
+
+    /**
+     * Validate a license key for a specific domain
+     *
+     * @param string $licenseKey The license key to validate
+     * @param string $domain The domain to validate against
+     * @return array Response data
+     * @throws Exception On request failure
+     */
+    public function validate(string $licenseKey, string $domain): array
+    {
+        return $this->request('/validate', [
+            'license_key' => $licenseKey,
+            'domain' => $domain,
+        ]);
+    }
+
+    /**
+     * Get the status of a license
+     *
+     * @param string $licenseKey The license key to check
+     * @return array Response data with status, domain, expiration, etc.
+     * @throws Exception On request failure
+     */
+    public function status(string $licenseKey): array
+    {
+        return $this->request('/status', [
+            'license_key' => $licenseKey,
+        ]);
+    }
+
+    /**
+     * Activate a license on a domain
+     *
+     * @param string $licenseKey The license key to activate
+     * @param string $domain The domain to activate on
+     * @return array Response data
+     * @throws Exception On request failure
+     */
+    public function activate(string $licenseKey, string $domain): array
+    {
+        return $this->request('/activate', [
+            'license_key' => $licenseKey,
+            'domain' => $domain,
+        ]);
+    }
+
+    /**
+     * Make an API request
+     *
+     * @param string $endpoint API endpoint path
+     * @param array $data Request data
+     * @return array Decoded response data
+     * @throws Exception On request failure
+     */
+    private function request(string $endpoint, array $data): array
+    {
+        $url = $this->baseUrl . $endpoint;
+
+        $ch = curl_init();
+        curl_setopt_array($ch, [
+            CURLOPT_URL => $url,
+            CURLOPT_POST => true,
+            CURLOPT_POSTFIELDS => json_encode($data),
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_TIMEOUT => $this->timeout,
+            CURLOPT_HTTPHEADER => [
+                'Content-Type: application/json',
+                'Accept: application/json',
+            ],
+        ]);
+
+        $response = curl_exec($ch);
+        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        $error = curl_error($ch);
+        curl_close($ch);
+
+        if ($response === false) {
+            throw new Exception('cURL error: ' . $error);
+        }
+
+        $decoded = json_decode($response, true);
+
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw new Exception('Invalid JSON response: ' . json_last_error_msg());
+        }
+
+        // Add HTTP code to response for easier handling
+        $decoded['_http_code'] = $httpCode;
+
+        return $decoded;
+    }
+}
+
+// =============================================================================
+// Usage Examples
+// =============================================================================
+
+// Uncomment to run examples:
+
+/*
+$client = new WcLicensedProductClient('https://your-wordpress-site.com');
+
+// Example 1: Validate a license
+try {
+    $result = $client->validate('XXXX-XXXX-XXXX-XXXX', 'myapp.example.com');
+
+    if ($result['valid']) {
+        echo "License is valid!\n";
+        echo "Status: " . ($result['license']['status'] ?? 'active') . "\n";
+        echo "Expires: " . ($result['license']['expires_at'] ?? 'Never') . "\n";
+    } else {
+        echo "License is not valid: " . ($result['message'] ?? 'Unknown error') . "\n";
+    }
+} catch (Exception $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+}
+
+// Example 2: Check license status
+try {
+    $status = $client->status('XXXX-XXXX-XXXX-XXXX');
+
+    echo "License Status:\n";
+    echo "  Valid: " . ($status['valid'] ? 'Yes' : 'No') . "\n";
+    echo "  Status: " . ($status['status'] ?? 'unknown') . "\n";
+    echo "  Domain: " . ($status['domain'] ?? 'none') . "\n";
+    echo "  Expires: " . ($status['expires_at'] ?? 'Never') . "\n";
+    echo "  Activations: " . ($status['activations_count'] ?? 0) . "/" . ($status['max_activations'] ?? 1) . "\n";
+} catch (Exception $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+}
+
+// Example 3: Activate license on a domain
+try {
+    $result = $client->activate('XXXX-XXXX-XXXX-XXXX', 'newsite.example.com');
+
+    if ($result['success'] ?? false) {
+        echo "License activated successfully!\n";
+    } else {
+        echo "Activation failed: " . ($result['message'] ?? 'Unknown error') . "\n";
+    }
+} catch (Exception $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+}
+
+// Example 4: Handling rate limits
+try {
+    $result = $client->validate('XXXX-XXXX-XXXX-XXXX', 'example.com');
+
+    if (($result['_http_code'] ?? 200) === 429) {
+        $retryAfter = $result['retry_after'] ?? 60;
+        echo "Rate limited. Retry after {$retryAfter} seconds.\n";
+    }
+} catch (Exception $e) {
+    echo "Error: " . $e->getMessage() . "\n";
+}
+*/

docs/client-examples/python-client.py

@@ -0,0 +1,233 @@
+"""
+WC Licensed Product API Client for Python
+
+A simple Python client for interacting with the WC Licensed Product REST API.
+
+Requirements:
+    - Python 3.7+
+    - requests library (pip install requests)
+
+Usage:
+    client = WcLicensedProductClient('https://your-site.com')
+    result = client.validate('XXXX-XXXX-XXXX-XXXX', 'example.com')
+"""
+
+import requests
+from typing import Dict, Any, Optional
+from dataclasses import dataclass
+
+
+@dataclass
+class LicenseStatus:
+    """License status response data."""
+    valid: bool
+    status: str
+    domain: Optional[str]
+    expires_at: Optional[str]
+    activations_count: int
+    max_activations: int
+
+
+class WcLicensedProductError(Exception):
+    """Base exception for API errors."""
+    def __init__(self, message: str, error_code: str = None, http_code: int = None):
+        super().__init__(message)
+        self.error_code = error_code
+        self.http_code = http_code
+
+
+class RateLimitError(WcLicensedProductError):
+    """Raised when rate limit is exceeded."""
+    def __init__(self, retry_after: int):
+        super().__init__(f"Rate limit exceeded. Retry after {retry_after} seconds.")
+        self.retry_after = retry_after
+
+
+class WcLicensedProductClient:
+    """Client for the WC Licensed Product REST API."""
+
+    def __init__(self, site_url: str, timeout: int = 30):
+        """
+        Initialize the client.
+
+        Args:
+            site_url: Your WordPress site URL (e.g., 'https://example.com')
+            timeout: Request timeout in seconds
+        """
+        self.base_url = site_url.rstrip('/') + '/wp-json/wc-licensed-product/v1'
+        self.timeout = timeout
+        self.session = requests.Session()
+        self.session.headers.update({
+            'Content-Type': 'application/json',
+            'Accept': 'application/json',
+        })
+
+    def validate(self, license_key: str, domain: str) -> Dict[str, Any]:
+        """
+        Validate a license key for a specific domain.
+
+        Args:
+            license_key: The license key to validate
+            domain: The domain to validate against
+
+        Returns:
+            Dict with 'valid' boolean and additional license info
+
+        Raises:
+            WcLicensedProductError: On API error
+            RateLimitError: When rate limited
+        """
+        return self._request('/validate', {
+            'license_key': license_key,
+            'domain': domain,
+        })
+
+    def status(self, license_key: str) -> LicenseStatus:
+        """
+        Get the status of a license.
+
+        Args:
+            license_key: The license key to check
+
+        Returns:
+            LicenseStatus object with license details
+
+        Raises:
+            WcLicensedProductError: On API error
+            RateLimitError: When rate limited
+        """
+        data = self._request('/status', {
+            'license_key': license_key,
+        })
+
+        return LicenseStatus(
+            valid=data.get('valid', False),
+            status=data.get('status', 'unknown'),
+            domain=data.get('domain'),
+            expires_at=data.get('expires_at'),
+            activations_count=data.get('activations_count', 0),
+            max_activations=data.get('max_activations', 1),
+        )
+
+    def activate(self, license_key: str, domain: str) -> Dict[str, Any]:
+        """
+        Activate a license on a domain.
+
+        Args:
+            license_key: The license key to activate
+            domain: The domain to activate on
+
+        Returns:
+            Dict with 'success' boolean and message
+
+        Raises:
+            WcLicensedProductError: On API error
+            RateLimitError: When rate limited
+        """
+        return self._request('/activate', {
+            'license_key': license_key,
+            'domain': domain,
+        })
+
+    def _request(self, endpoint: str, data: Dict[str, Any]) -> Dict[str, Any]:
+        """
+        Make an API request.
+
+        Args:
+            endpoint: API endpoint path
+            data: Request data
+
+        Returns:
+            Decoded response data
+
+        Raises:
+            WcLicensedProductError: On API error
+            RateLimitError: When rate limited
+        """
+        url = self.base_url + endpoint
+
+        try:
+            response = self.session.post(url, json=data, timeout=self.timeout)
+        except requests.RequestException as e:
+            raise WcLicensedProductError(f"Request failed: {e}")
+
+        # Handle rate limiting
+        if response.status_code == 429:
+            retry_after = int(response.headers.get('Retry-After', 60))
+            raise RateLimitError(retry_after)
+
+        try:
+            result = response.json()
+        except ValueError:
+            raise WcLicensedProductError("Invalid JSON response")
+
+        # Check for API errors
+        if response.status_code >= 400 and 'error' in result:
+            raise WcLicensedProductError(
+                result.get('message', 'Unknown error'),
+                error_code=result.get('error'),
+                http_code=response.status_code,
+            )
+
+        return result
+
+
+# =============================================================================
+# Usage Examples
+# =============================================================================
+
+if __name__ == '__main__':
+    # Initialize the client
+    client = WcLicensedProductClient('https://your-wordpress-site.com')
+
+    # Example 1: Validate a license
+    print("=== Validate License ===")
+    try:
+        result = client.validate('XXXX-XXXX-XXXX-XXXX', 'myapp.example.com')
+
+        if result.get('valid'):
+            print("License is valid!")
+            print(f"Status: {result.get('license', {}).get('status', 'active')}")
+            print(f"Expires: {result.get('license', {}).get('expires_at', 'Never')}")
+        else:
+            print(f"License is not valid: {result.get('message', 'Unknown error')}")
+
+    except RateLimitError as e:
+        print(f"Rate limited. Retry after {e.retry_after} seconds.")
+    except WcLicensedProductError as e:
+        print(f"Error: {e}")
+
+    print()
+
+    # Example 2: Check license status
+    print("=== Check License Status ===")
+    try:
+        status = client.status('XXXX-XXXX-XXXX-XXXX')
+
+        print(f"Valid: {'Yes' if status.valid else 'No'}")
+        print(f"Status: {status.status}")
+        print(f"Domain: {status.domain or 'None'}")
+        print(f"Expires: {status.expires_at or 'Never'}")
+        print(f"Activations: {status.activations_count}/{status.max_activations}")
+
+    except RateLimitError as e:
+        print(f"Rate limited. Retry after {e.retry_after} seconds.")
+    except WcLicensedProductError as e:
+        print(f"Error: {e}")
+
+    print()
+
+    # Example 3: Activate license on a domain
+    print("=== Activate License ===")
+    try:
+        result = client.activate('XXXX-XXXX-XXXX-XXXX', 'newsite.example.com')
+
+        if result.get('success'):
+            print("License activated successfully!")
+        else:
+            print(f"Activation failed: {result.get('message', 'Unknown error')}")
+
+    except RateLimitError as e:
+        print(f"Rate limited. Retry after {e.retry_after} seconds.")
+    except WcLicensedProductError as e:
+        print(f"Error ({e.error_code}): {e}")

wc-licensed-product.php

@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Licensed Product
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wc-licensed-product
  * Description: WooCommerce plugin to sell software products using license keys with domain-based validation.
- * Version: 0.0.8
+ * Version: 0.0.9
  * Author: Marco Graetsch
  * Author URI: https://src.bundespruefstelle.ch/magdev
  * License: GPL-2.0-or-later
@@ -28,7 +28,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Plugin constants
-define('WC_LICENSED_PRODUCT_VERSION', '0.0.8');
+define('WC_LICENSED_PRODUCT_VERSION', '0.0.9');
 define('WC_LICENSED_PRODUCT_PLUGIN_FILE', __FILE__);
 define('WC_LICENSED_PRODUCT_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('WC_LICENSED_PRODUCT_PLUGIN_URL', plugin_dir_url(__FILE__));