Step 1:

Log in to your WisePops account.

Step 2:

Click "Tracking code" in the header and copy the tracking code:

Step 3:

Find the header.php file in the following OpenCart folder: Catalog > View > Theme > Template > Common

Step 4:

Open the file and paste your WisePops tracking code before the closing</header> tag.
Press save.

Step 5:

Check the setup using Chrome or Firefox

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