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Edit File: class-kl-plugins-screen-updates.php

<?php
/**
 * Manages Klaviyo plugin updating on the Plugins screen.
 *
 * @package   WooCommerceKlaviyo
 * @version     2.4.0
 */

/**
 * KL_Plugins_Screen_Updates
 */
class KL_Plugins_Screen_Updates {

/**
	 * The version for the update to Klaviyo.
	 *
	 * @var string
	 */
	protected $new_version = '';

/**
	 * The upgrade notice shown inline.
	 *
	 * @var string
	 */
	protected $upgrade_notice = '';

/**
	 * Upgrade notice messages for specific versions.
	 */
	const UPGRADE_NOTICE_BY_VERSION = array(
		'2.4.0' => '<b>IMPORTANT:</b> Please review and save your Klaviyo plugin settings after upgrading to ensure consistent functionality.',
	);

/**
	 * Hook into `in_plugin_update_message` action.
	 */
	public function __construct() {
		add_action( 'in_plugin_update_message-klaviyo/klaviyo.php', array( $this, 'in_plugin_update_message' ), 10, 2 );
	}

/**
	 * Callback method that adds upgrade notice in Plugins page.
	 *
	 * @param array  $plugin_data An array of plugin metadata.
	 * @param object $response An object of metadata about the available plugin update.
	 */
	public function in_plugin_update_message( $plugin_data, $response ) {
		$this->new_version    = $response->new_version;
		$this->upgrade_notice = $this->get_upgrade_notice();

echo $this->upgrade_notice ? '</p><p>' . wp_kses_post( $this->upgrade_notice ) : '';
	}

/**
	 * Gets upgrade notice for corresponding new version from map.
	 *
	 * This can be expanded to utilize data available in plugin
	 * readme.txt but keeping this super basic and manual for now.
	 *
	 * @return string
	 */
	protected function get_upgrade_notice() {
		if ( isset( self::UPGRADE_NOTICE_BY_VERSION[ $this->new_version ] ) ) {
			return self::UPGRADE_NOTICE_BY_VERSION[ $this->new_version ];
		}
	}
}

new KL_Plugins_Screen_Updates();

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