Define the API URL

Author: robincornett

src/Requests/API.php

@@ -20,6 +20,13 @@
  */
 class API {
 
+	/**
+	 * The API URL.
+	 *
+	 * @var string
+	 */
+	private $api_url;
+
 	/**
 	 * The class constructor.
 	 *