Copy Payments.IPay folder to the Plugins folder in the website root folder

In nopCommerce admin section:
1. Click "Configuration -> Plugins -> Local Plugins"
2. Scroll down to Ozow (Secure real-time EFT)
3. Click the Install button
4. Click on the Edit button
5. Check the Is active checkbox
6. Click the Update button
7. Click on the Configure button
8. Enter your site details
9. Make sure Test Mode is not checked if your site is live
10. Click the Save button