Go to Configuration >
Payment and Shipping Gateways and click to edit
2Checkout.
For 'friendly name', you can enter
'2Checkout', or just simply 'Credit Card'. This is just the name of
the payment method that customers will get to choose on the web site
during checkout if you have multiple payment
methods.
Change the status from 'OFF' to 'ON' (for
live orders) or 'TEST' or 'FAKE' for testing. 'TEST' invokes a demo
order, allowing you to test the full integration and pass multiple
orders at zero cost without needing to do refunds. 'FAKE' means that
Kartris will skip the 2Checkout site and instead format a post back
itself to the callback page of Kartris. This is useful for testing
that the callback process works, triggers the appropriate emails and
so on without keep having to keep going through the 2Checkout payment
process.
Set your 'SID', which is the vendor
number assigned to you by 2Checkout.