From my understanding, ZeeVex sells product pins.
You use cash or payment to purchase Tokens for which you can buy product pins.
If you can purchase Aeria Games EPins on ZeeVex then you can use that EPin on the billing page under prepaid - spins
EPins will begin with EP and are sold by many digital goods vendors not listed on the Aeria Site.
I'll investigate this further when not at work.
[Edit] this is exactly what zeevex does. They allow you to purchase Epins, which are redeemable on the Aeria Billing page. However support for this will come from ZeeVex only.
(Side note) Although this topic was Necro'd, the information is valuable. But in the future please make a new topic ^_^