Is PayPal not supported at all currently?
Not yet I'm afraid, will take a while to implement.
Also did I miss an announcement or there was none (at least yet) that C3 is available for purchase?
Keeping it low key right now to make sure everything works smoothly before widely advertising.
Btw, just a note: I'd strongly suggest to change the "Splash Screen" text to "Custom Splash Screen" on the Construct.net
Yep, makes sense! Will change this on Monday.