<?php
namespace MangoPay;

/**
 * Class represents template URL options
 */
class PayInTemplateURLOptions extends Libraries\Dto
{
    /**
     * PAYLINE options - Will be deprecated on March 31th (Sandbox) and April 30th (production)
     *
     * @var string
     */
    public $PAYLINE;
    
    /**
     * PAYLINEV2 options - to be used instead of PAYLINE options
     *
     * @var string
     */
    public $PAYLINEV2;
    
}

<?php
namespace MangoPay;

/**
 * Class represents template URL options
 */
class PayInTemplateURLOptions extends Libraries\Dto
{
    /**
     * PAYLINE options
     *
     * @var string
     */
    public $PAYLINE;
}

--- 
+++ 
@@ -7,9 +7,17 @@
 class PayInTemplateURLOptions extends Libraries\Dto
 {
     /**
-     * PAYLINE options
+     * PAYLINE options - Will be deprecated on March 31th (Sandbox) and April 30th (production)
      *
      * @var string
      */
     public $PAYLINE;
+    
+    /**
+     * PAYLINEV2 options - to be used instead of PAYLINE options
+     *
+     * @var string
+     */
+    public $PAYLINEV2;
+    
 }
Add PAYLINEV2 for Payin Web