To install Survicate on your website using Google Tag Manager, you will need a Workspace key:

Copy it and go to your Tag Manager.
Click on the Tags > New > Tag Configuration > Survicate Widget  and paste the key into Instalation Code field in GTM

Click on Triggering and select "All Pages" > Save and Submit!

The rest of targeting is made via Survicate panel in "Settings" tab of a survey.
More on that here.

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