It's nowhere mentioned to courier and also take print of receipt. WhatNewWorld said:If you have sent the PCC earlier (and it is not more than 1 year old) then you do not need to send it.
But if you have not send it earlier then you will get an email notifying that you should submit it. Generally, it is in the same email in which you got PRPF request.
Send the PRPF receipt also to via courier to be on safe side. Also in the email they might have mention that you need to print that email (the email requesting PRPF fees) and have to send to them.
Hope this helps