Well I applaud your knowledge, as to my knowledge I don't think anyone has even done research on what Jest means.
The dictionary use to have "something to cause amusement, an act of entertainment, a joke"
Merriam Webster's definition is not so nice

It's explained in my About page, towards the bottom with my bio. It was my high school nick name, license plate, and in game name.
As for billing details you don't have to worry as I use paypal, you are forwarded to paypal.com to process your payment or google checkout if you want. I never see any of your billing information. Less work for me, more security for you.
You can also just google jestservers and see what pops up, been around for a while now.