We have taken many strides to build a secure billing system that would minimize the risk of compromising your credit card information. To that end we leverage a 3rd-party called Stripe that specializes in handling credit card transactions. We do not keep your financial information and when you enter it to make a payment it is actually entered directly to Stripe's user interface and handled with utmost care.
For those who are not familiar, Stripe is a very well funded company in the Silicon Valley backed by well known VCs and working with the largest companies out there including Apple, Twitter, and Alibaba. More importantly they have been audited by a PCI-certified auditor, and have been certified as a PCI Level 1 Service Provider, the most stringent level of certification available. PCI, for those not familiar, is the data security standard that the payment card industry relies on.