I've been a 2checkout customer, and am used to the old interface at: https://sellers.2checkout.com/cgi-bin/sellersarea/login.pl. Recently, I've signed up for a new account, and my new seller ID is above 200000, which directs my account to the new interface at: https://www2.2checkout.com/2co/login. The features of the new system look as though they are meant to be a lot easier to use.
But since I'm used to the old Passback Parameters on the: > Account Details > Return (Edit) page, I can't figure out where to put the equivalent "cartpurchase.2c, and Overall Passback parameters" in the new system. Is anyone familar with this?

2checkout accept more countrys for payments then paypal thats why i like it more