Is my Credit Card / PayPal payment secure?

Absolutely!
GamersGate protects transactions by using well established and internationally recognized payment provider solutions who takes advantage of SSL (Secure Sockets Layer) encryption. In short, SSL encrypts information you are sending through the Internet, into a complex code that no one else can read or change. SSL is just as secure, as if you use your credit card at an ATM.
If you wish to verify this, please right click on the URL bar and look at the properties. You will see that the destination address begins with https:// — a sign for a secure connection.
Gamersgate uses payment services, provided by other companies, and we do not deal with payments at all. All is done via payment services (like Paypal, Smart2Pay).