Steps to add on-site popups to your OpenCart Store
Sign up for an account on PushAlert, head to the Dashboard and into the Integrate (Setup) section from the left menu.
Click on Design in the left sidebar menu. Then, choose Theme Editor.
On the next page, click on Common and then footer.twig.
Paste the integration code copied in Step 2 just before the body tag ends (
</body>) as shown in the image below and save. You may need to clear your OpenCart cache.
You are now all set to engage users with personalized popups and gamification.