Include Klaviyo for Elementor pro

This plug in allow you to add or subscribe users to Klaviyo's list memberships and subscriptions using Elementor pro form.

Klaviyo offical website: https://www.klaviyo.com/

To achieve this, the pluin using Klaviyo list's API (you can read more here: https://developers.klaviyo.com/en/reference/api_overview)

To use this plugin, you will need an API key provide by Klaviyo when using their services. That mean when using this pluign you are agree with Klaviyo's Legal, Terms, & Policies here: https://www.klaviyo.com/legal

Known Issues: Fatal Error Call to a member function get_modules() on null:

• Temporary deactivate the plugin
• update Elementor/Elementor Pro or run Elementor Database Updater
• Reactivate my plugin again