I am working in one of the very big petrochemical project from it construction to startup   and still working there  but I was working in operations department  not exactly in project department , also not as a project manager or a leader , but the fact is that I covered lot project activities can I apply for PMP and do I need any evidences from  my present employer or manager.  If I required ,can any  one give me the format for the experience letter which I need to take from my present employer which will be acceptable by PMP(PMI).