Websatisfaction wrote: We contacted 2Checkout on this matter because there in know way of changing this that we can see.
But neither manual (Cbsubs or 2checkout) mention " URL* " or how to change it. In the 2Checkout manual on page-5 they literally skip this paramater.

Does this have to do with it being in demo mode?

That's correct. CBSubs manual is not a 2checkout account creation reference guide. You did the right thing to contact them as I believe there is no way to change this once it is set.