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You can designate a link in your email content to generate a link_unsubscribe event when clicked using the data-msys-unsubscribe custom attribute. 
<a href="http://www.example.com/unsub_handler?id=1234" data-msys-unsubscribe="1">
  Unsubscribe
</a>
Click tracking must be enabled for the link_unsubscribe event to be generated.
When click tracking is enabled at the transmission level, you can selectively disable it for individual links using the data-msys-clicktrack custom attribute set to "0": 
<a href="http://www.example.com/" data-msys-clicktrack="0">
  Click here
</a>
This is useful when you want click tracking active for most links in your email, but need specific links (such as unsubscribe URLs or legal links) to remain untracked.

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App deep linking

Disabling click tracking on specific links is essential for app deep links. Mobile platforms like iOS and Android verify deep links by checking verification files hosted on the link’s domain (e.g. apple-app-site-association or assetlinks.json). When click tracking is enabled, the link is rewritten to go through a tracking domain that doesn’t host these verification files, causing the deep link to fail and open in the browser instead of the app. By adding data-msys-clicktrack="0" to your deep links, the original URL is preserved, allowing the operating system to verify the domain and open the link directly in your app.