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The click ID will be transmitted as query parameter in the URL with every click. This happens with the use of the additional parameter tool.
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You reach this page by clicking on ‘manage advertiser’ in the advertiser section main navigation menu. On the page with the overview of all the advertisers on your platform, click on the icon next to the relevant advertiser. You will find the additional parameter feature in the middle of the page.
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When you are done, scroll down the page and click on the button ‘save’ in the right lower corner.
Example result: https://yourshopdomain.com/?clicklid=#{CLICK_ID}
read more here: Additional parameters
Transmitting a custom click ID
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Further reading on how to implement the conversion code: