Where is my AJAX call going?
IEF = Inline Entity Form; you should find what you're looking for in that module. If you're new to Drupal the layers of abstraction might make it difficult to understand what's going on though. If there's something in particular you're looking to find out how to alter or understand just update the question. 

If you install the Devel module and add 

dpm($form['customer_profile_ip_info']['field_company_ip_customer_info']['und'][‌​'actions']['ief_add']); 


to your alter hook you should find the #ajax property.