How To Create A Licensing System Using PHP, Composer and OOP for a Custom WordPress Plugin or a Bespoke PHP Software

Here is how to create a licensing system using PHP, Composer and OOP for a custom coded WordPress plugin so that every paying user gets a license key and can use the plugin while non-paying users cannot.

Create a LicenseValidator Class

First Install GuzzleHttp, which is a PHP HTTP client, via Composer. Run the following command in your project directory to install GuzzleHttp:

composer require guzzlehttp/guzzle

Than we will create a new PHP class that will handle the license validation for our plugin. Create a new file called “LicenseValidator.php” in your plugin directory and add the following code:

<?php

namespace YourPluginNamespace;

define('LICENSE_ENDPOINT', 'http://mylicensingserver.com/validate_license.php');

class LicenseValidator
{
    private $license_key;
    private $product_id;

    public function __construct($license_key, $product_id)
    {
        $this->endpoint_url = LICENSE_ENDPOINT;
        $this->license_key = $license_key;
        $this->product_id = $product_id;
    }

    public function isValid()
    {
      // Make a request to the licensing server to validate the license
      $request = new…