Update and fix safe redirect to purchase link

src/Admin/Admin.php

@@ -23,6 +23,7 @@ public function __construct() {
 		add_filter( 'woocommerce_screen_ids', array( $this, 'screen_ids' ) );
 		add_filter( 'admin_footer_text', array( $this, 'admin_footer_text' ), PHP_INT_MAX );
 		add_filter( 'update_footer', array( $this, 'update_footer' ), PHP_INT_MAX );
+		add_filter( 'allowed_redirect_hosts', array( $this, 'allowed_redirect_hosts' ) );
 	}
 
 	/**
@@ -182,4 +183,19 @@ public static function view( $view, $args = array(), $path = '' ) {
 
 		include $file;
 	}
+
+	/**
+	 * Allowed redirect hosts.
+	 *
+	 * @param array $hosts Allowed hosts.
+	 *
+	 * @since 1.0.0
+	 * @return array
+	 */
+	public function allowed_redirect_hosts( $hosts ) {
+		$hosts[] = 'pluginever.com';
+		$hosts[] = 'www.pluginever.com';
+
+		return $hosts;
+	}
 }

src/Admin/Menus.php

@@ -306,8 +306,8 @@ public function output_reports_page() {
 	public function go_pro_redirect() {
 		wp_verify_nonce( '_nonce' );
 		if ( isset( $_GET['page'] ) && 'go_wcsn_pro' === $_GET['page'] ) {
-			wp_redirect( 'https://pluginever.com/plugins/woocommerce-serial-numbers-pro/?utm_source=admin-menu&utm_medium=link&utm_campaign=upgrade&utm_id=wc-serial-numbers' );
-			die;
+			wp_safe_redirect( 'https://pluginever.com/plugins/woocommerce-serial-numbers-pro/?utm_source=admin-menu&utm_medium=link&utm_campaign=upgrade&utm_id=wc-serial-numbers' );
+			exit;
 		}
 	}