First, head over to https://app.datatrics.com/integrations/ and search for Hellodialog.
Click on the "Install" button, and you will be redirected to the settings screen.
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In the input box "API key" fill in the API key you can find and create in Hellodialog > Settings > API. Then, please select the applicable language.

Datatrics will use the Hellodialog integration to sync profiles, known segments and add dynamic images to your e-mails.