With the help of this integration you can start collecting subscribers for your sendinblue list using a form built in Kali Forms.
This add-on is only available for Kali Forms Pro users.
Using the add-on
The first thing that you will need to do is retrieve your sendinblue API Key. This is done over at the sendinblue site.
Login into your sendinblue account and navigate to Account (top right corner) > SMTP & API > Create a New API Key.

Copy the newly generated API key, then access your WordPress admin panel and add this in the Kali Forms > Newsletter > sendinblue field.

Now that the connection is established with your sendinblue account we need to setup the form. You can use one of our available One-click import templates to get started, then make adjustments to the form for this specific use-case or use a new form and build this from the ground up. The sendinblue configuration is available in the Settings > Newsletter tab of your form configuration.

User consent field
You can condition the newsletter subscription process based on the user consent. By enabling this option if the consent field does not have the correct value you have configured the subscription to your list will not be made.