MailerLite can be used as:
Connecting your MailerLite account with Ads Workbench is really simple. But before creating the connection you need to gather an API key from your MailerLite account. You can find your key in the section Integrations -> Developer API in your MailerLite account as shown in the following image:
Once gathered the required information, you just need to follow these steps:
A lead flow is an automation that allows you to collect the leads coming from a source and send them to multiple destinations. Once your ad account is connected and your have created the integrations for the systems where the leads will be sent, you can create you lead flow as described in the following video:
An audience flow is an automation that allows you to keep fresh your custom audiences using as an input your subscribers' or contacts' data. Once your ad account is connected and your have created the integrations for the systems where your contacts' data is stored you can create you audience flow as described in the following video: