laipower/wp-content/themes/generatepress/inc/customizer/controls/class-upsell-control.php

<?php
/**
 * The upsell Customizer controll.
 *
 * @package GeneratePress
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

if ( class_exists( 'WP_Customize_Control' ) && ! class_exists( 'Generate_Customize_Misc_Control' ) ) {
	/**
	 * Create our in-section upsell controls.
	 * Escape your URL in the Customizer using esc_url().
	 *
	 * @since 0.1
	 */
	class Generate_Customize_Misc_Control extends WP_Customize_Control {
		/**
		 * Set description.
		 *
		 * @var public $description
		 */
		public $description = '';

		/**
		 * Set URL.
		 *
		 * @var public $url
		 */
		public $url = '';

		/**
		 * Set type.
		 *
		 * @var public $type
		 */
		public $type = 'addon';

		/**
		 * Set label.
		 *
		 * @var public $label
		 */
		public $label = '';

		/**
		 * Enqueue scripts.
		 */
		public function enqueue() {
			wp_enqueue_style(
				'generate-customizer-controls-css',
				trailingslashit( get_template_directory_uri() ) . 'inc/customizer/controls/css/upsell-customizer.css',
				array(),
				GENERATE_VERSION
			);
		}

		/**
		 * Send variables to json.
		 */
		public function to_json() {
			parent::to_json();
			$this->json['url'] = esc_url( $this->url );
		}

		/**
		 * Render content.
		 */
		public function content_template() {
			?>
			<p class="description" style="margin-top: 5px;">{{{ data.description }}}</p>
			<span class="get-addon">
				<a href="{{{ data.url }}}" class="button button-primary" target="_blank">{{ data.label }}</a>
			</span>
			<?php
		}
	}
}