To enable the 2Checkout 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 2Checkout entry.

3. Put in the value you obtained from 2Checkout for the 'Vendor ID'.

4. Click 'Save and Close'.

5. Finally, click the radio button next to 2Checkout and then click the 'Submit' button.

Setting the return URL in 2Checkout

1. In the 2Checkout account, go to Account - Site Management

2. Select the option: "Given Links back to my website" in the Direct Return section

3. Enter the return URL for your site in the "Approved URL" in the format: https://www.yoursite.com/twocheckout_return.aspx

4. Save Changes