Your job is to develop a WordPress plugin, compatible with the current version of WordPress, that uses the Verifigator API to validate in real-time an email address. The WP plugin allows WP site webmaster to use the plugin to validate one or more email input fields in any form of his site. The API definition and sample code is attached.
When the plugin is installed, it adds a new page to the admin area of the WP. From this admin area, it must be possible for the user to define the validation settings used with the Verifigator API, as well as the user must be able to enter his API key in order to use the API. Similar to the Akismet plugin.