Cannot purchase SU-130pm with Karma Koin?

DomoSapien: From time to time certain bundles are restricted to refundable-payment-methods only, as certain options have a slightly higher risk for fraud - I'm guessing since these are marathon tokens rather than the vehicle itself and there is a bit more work involved in refunding these purchases, they might fall into this category.   That said, if you have any concerns with using your Credit Card on our Premium Shop, we do accept Paypal as an alternate payment method as well. 
However I did want to point out: we don't actually process any payments directly. All payments made to Wargaming.net are processed by third-party billing partners, such as Paypal Braintree, Paymentwall, Adyen, etc. With this in mind, you aren't actually giving any of your credit card information etc. to Wargaming when making your purchases. If you have any concerns about our security in particular, we aren't actually getting any of your credit card information when you make purchases with us.

At the end of the day, of course, it's your call! I'm not here to tell you how to spend your hard-earned cheddar. I'm just glad you play our game <3