Updating config.php

app/config.php.sample

 <?php
 /* Configuration file for Campaign manager */
-define("CAMPAIGN_ID","1");
+define("CAMPAIGN_ID", getenv("CAMPAIGN_ID") ? getenv("CAMPAIGN_ID") : "1");
 define("API_BASE","http://localhost/restapi/");
 define("API_TIMEOUT","1");
 define("JWT_KEY", "YOUR_KEY");