For those people who just want to use their credit cards to buy n points there's an easy way.
Before going to the site if you think it sounds fishy open your PUS hit redeem and click on rixty, its a viable way to buy n points.
Bsically, you make an account on rixty ( there is an option to log in with facebook )
click on top-up account
enter how much you need ( in dollars ) where it says "input amount to top up" ( maximum amount is $100 at a time )
Now that you have the money on your rixty account log into power up store, click rixty option, an log in to rixty account ( again used face book option )
redeem your points ( you an choose to use all the money you have loaded to rixty, or a partial amount )
Boom, you now have npoints on your account.
I figured this could help a couple people
You can als buy a rixty "card" at some stores. I bought one at a "flying J" and what it does is print you out a pin number (similar to a esn code) that you can enter in the payment
option section of the PUS.