Anyone who has created a WordPress plugin understands the need to create configurable fields to modify how the plugin works. There are countless uses for configurable options in a plugin, and nearly as many ways to implement said options. You see, WordPress allows plugin authors to create their own markup within their settings pages. As a side effect, settings pages can vary greatly between plugins. In this article we are going to go over three common ways you can make your plugin configurable. We will start by creating a settings page and create our fields using the default WordPress Settings API. I will then walk you through how to set up your fields with a custom handler. Finally, I will show you how to integrate a great configurable fields plugin Advanced Custom Fields (ACF) into your own plugin.
Fonte: Three Approaches To Adding Configurable Fields To Your WordPress Plugin – Smashing Magazine