Connect MailerLite Classic

Create an API key as described here: Where to find your MailerLite account API key - MailerLite
Get the group name where the leads should be added to.
Send the Newsletter System name, the API key and the group name to Sovendus

Create an API key as described here: Where to find your MailerLite account API key - MailerLite
Get the group name where the leads should be added to.
Send the Newsletter System name, the API key and the group name to Sovendus