OpenCart integration guide
OpenCart is a free shopping cart system. Integrate your Olark live chat with this open source PHP-based online e-commerce solution in a few quick steps.
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Log into the site where your OpenCart site is hosted using either a standard FTP client or the Cpanel File manager. (Many hosting companies provide File Manager access inside of Cpanel)
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Navigate to the ROOT directory of OpenCart. (This will often be “WWW” or “Public_html”)
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Go to catalog > view > theme folder.

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Open the theme folder that you are currently using. “default” is the default theme. (You can find the name of your theme inside the OpenCart admin area, in System > Settings > Store at the bottom of the Template tab.)

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Go to template > common folder.

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Open the footer.tpl file with a simple editor like Notepad. Log in and copy your Olark embed code. Paste it above the end tag at the bottom of the window.

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Click Save as and type file name footer.tpl (Do not forget to type the file extension .tpl)
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Save the new edited footer.tpl file on your PC.
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Replace the existing footer.tpl file on the server with your newly created footer.tpl file.
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Now open your site and check out Olark on your OpenCart Site.