Configuration:2Checkout

Activate Module

 1) Open payment module manager
 2) Select "2Checkout" and click "Activate".

Module Configuration

 Please login to Vendor Area and go to (1) and (2). 

 Now copy callback URL from HostBill(5) and paste into Approved URL(6) and Pending URL(7). 

 Please note that (3) and (4)  are mandatory. You will get them from 2co's vendor area.