In some cases, you may want an interactive (registration) site in your event use a different e-commerce account (i.e. not the default one set in Event Preferences).
You should:
1. Navigate to Online Panel.
2. Open the Site Builder for the online interactive site.
3. Click on the Details Tab to see where you can select the option “Override Default Event E-Commerce Account”
4. Select the E-Commerce account from the dropdown list (assuming you previously set up your other e-Commerce account) and enter the e-Commerce Reference.
This will allow you to process payments on this particular Interactive Site through an e-Commerce account other than the default one for this event.