...
Find the configuration page of the Emarsys integration by searching for it in the Modules 
menu.
Configuring the Antavo – Emarsys connection
The setup of the Emarsys integration requires inserting your Emarsys API username and password which can be obtained from the Security settings section settings in the Emarsys platform.
...
Customer synchronization
Once the connection is set, selecting Emarsys from the list of integrations allows you to select the customer data to be synchronized from Antavo to Emarsys.
...