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Paste the code to your OpenCart website’s HTML field.
Next, go to your OpenCart store editor and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on the OpenCart’s editor. Add it to your page, and paste the Notification Popup Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Notification Popup extension on your OpenCart store.