If I work with clients internationally, can my Coaches Console system support payments from them?

Yes, The Coaches Console currently accepts all international currencies currently recognized through PayPal. You can invoice your clients in various currencies AND you can invoice different clients in different currencies. Here is the list of currencies accepted by PayPal:

https://www.paypal.com/cgi-bin/webscr?cmd=p/sell/mc/mc_intro-outside