I can certainly say that the game itself will not be modified in any way unless Afro Ninja does so.
XGen has stopped development of Flash Games, as many other publishers have.
In terms of payment options, I’m not sure if this is something that XGen could - or would - change.
Edit: Regarding payment options: XGen uses PayPal as a gateway to process credit card transactions. While your only option is to check out using PayPal, after clicking the option to do so you can simply opt to enter a credit/debit card number. Creating a PayPal account is optional.