With the help of this integration you can start collecting subscribers for your SendFox 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 SendFox Personal API Token. This is done over at the SendFox site.
Login into your SendFox account and navigate to Account (top right corner) > Settings > API > Create New Token.

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

Now that the connection is established with your SendFox 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 SendFox configuration is available in the Settings > Newsletter tab of your form configuration.

One thing to note is that SendFox does not support custom fields at the moment, you can only map the email, first name and last name.
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.