SSL With multiple AP's

Hi,

I have a central User Manager server and several AP’s that connect directly to it.

I am following the Wiki Guide for PayPal setup (http://wiki.mikrotik.com/wiki/User_Manager/User_payments#PayPal), and it says that I will need to setup a SSL cert on the router. Does this mean I need a SSL cert on every AP, or just the User Manager server? If so, then to avoid getting security warnings from the web browser will I need to purchase a SSL cert from someone like InstantSSL? If this is the case is there a better way to set this up so I don’t need to buy multiple SSL certificates?

Any help would be greatly appreciated.

You need only one certificate on User Manager router, AP router does not need certificates.