First, head over to https://app.datatrics.com/integrations/mailplus/. Click on the "Install" button, and you will be redirected to the settings screen:

You are asked to fill in 3 fields. 

Both the Key and Secret can be found in Spotler itself. Make sure you create a new Key and Secret if you already use it for something else, like a connection with your webshop. If you're not sure how to do this, you can contact Spotler for help and advice.
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After activating the Spotler Rest API, head over to your dashboard and click on "MailPlus(Spotler) Settings" followed by "MailPlus (Spotler) Rest API". Here you will find both values. Simply copy and paste them to our fields.

Update Profiles can be set to either yes or no. Changing this value determines whether we sync our profile data to Spotler.

After entering all settings on the Spotler settings page, click on Save Settings.

Datatrics will use the Spotler integration to sync profiles, segments, hybrid campaign triggers and predictive fields (enrichment sync).

Predictive fields will be displayed in Spotler like this:
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Datatrics - Potential
Datatrics - Opportunity
Datatrics - Engagement
Datatrics - Persuasion
Datatrics - Buyingphase
Datatrics - Customertype