Confirm user license key on envato marketplaces

envato-class.php

<?php 
	

	class Envato 
	{
		protected static $key      = "";
		protected static $username = "";


		public static function verify( $code )
		{
			if (empty(self::$key))
			{
				throw new Exception("No key was set");
			}

			if (empty(self::$username))
			{
				throw new Exception("No username was set");
			}

			$url = sprintf( "http://marketplace.envato.com/api/v3/%s/%s/verify-purchase:%s.json",  self::$username, self::$key, $code );

			$ch = curl_init( $url );
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			$ch_data = curl_exec($ch);
			curl_close($ch);

			if (empty($ch_data))
			{
				throw new Exception("Couldn't connect to the server");
			}

			$data = json_decode( $ch_data , true );

			if (empty($data['verify-purchase']))
			{
				throw new Exception("Invalid item purchase code");
				return false;
			}

			return true;

		}


		public static function set_key( $key )
		{
			self::$key = $key;
		}

		public static function set_username($username)
		{
			self::$username = $username;
		}
	}

example.php

<?php
Envato::set_key("YOUR-ENVATO-API-KEY");
Envato::set_username("YOUR-USERNAME");
	

	try {
		$test = Envato::verify("4efd2738-02fd-4e2f-92f0-2b07149203d4");
		if ($test)
		{
		  echo "We have a legit user";
		}
	}
	catch(Exception $e)
	{
		echo $e->getMessage();
	}