2. Get API key
Please go to menu "Settings" > "API Keys" and get the existing API key or create the new API
3. Get List Contact ID
Go to Marketing => Contacts => Create your list:
Then open your list and copy the list ID.
Enter the API key and Contact list ID to the integration form:
All fields name are supported: emai, first_name, last_name, country, city, address_line_1, address_line_2