To enable the Sage Payments gateway:
1. In the AspDotNetStorefront admin console, go to the Site Configuration Wizard page.
2. In the Payment Gateway section, click the 'configure' link next to the Sage Payments entry.
3. Put in the values you obtained from Sage Payments for the 'Merchant ID' and 'Merchant Key'.
4. Click 'Save and Close'.
5. Finally, click the radio button next to Sage Payments and then click the 'Submit' button.