Connect Brevo

Create an API key as described here: Create and Manage API keys - brevo
Get the id of the list where leads should be added to. Go to contacts → lists. The id can be found in the id column
Send the Newsletter System name, the API key and the list id to Sovendus

Create an API key as described here: Create and Manage API keys - brevo
Get the id of the list where leads should be added to. Go to contacts → lists. The id can be found in the id column
Send the Newsletter System name, the API key and the list id to Sovendus