How to add license handling and extension updating to your Inbound Now extensio

extension-licensing.php

<?php

/** Define constants somewhere in plugin */
define('EXTENSION_CURRENT_VERSION', '1.0.5' ); 
define('EXTENSION_LABEL' , 'Extension Integration' ); 
define('EXTENSION_SLUG' , plugin_basename( dirname(__FILE__) ) ); 
define('EXTENSION_FILE' ,  __FILE__ ); 
define('EXTENSION_REMOTE_ITEM_NAME' , 'extension-integration' ); 
define('EXTENSION_URLPATH', plugins_url( ' ', __FILE__ ) ); 
define('EXTENSION_PATH', WP_PLUGIN_DIR.'/'.plugin_basename( dirname(__FILE__) ).'/' ); 

/** Setup Automatic Updating & Licensing */
add_action('admin_init', 'license_setup' );

/**
* Setups Software Update & Licenseing API 
*/
function license_setup() {
	/*PREPARE THIS EXTENSION FOR LICESNING*/
	if ( class_exists( 'Inbound_License' ) ) {
			$license = new Inbound_License( EXTENSION_FILE , EXTENSION_LABEL , EXTENSION_SLUG , EXTENSION_CURRENT_VERSION  , EXTENSION_REMOTE_ITEM_NAME ) ;
	}
}