<?php
namespace MangoPay;

/**
 * Class represents direct debit type for mean of payment in PayIn entity
 */
class PayInPaymentDetailsDirectDebit extends Libraries\Dto implements PayInPaymentDetails
{
    /**
     * Direct debit type {SOFORT, ELV, GIROPAY}
     * @var string
     */
    public $DirectDebitType;
	    
     /**
      * Mandate Id
      * @var string
      */
     public $MandateId;
	 
	 /**
     * StatementDescriptor
     * @var string
     */
     public $StatementDescriptor;
}

<?php
namespace MangoPay;

/**
 * Class represents direct debit type for mean of payment in PayIn entity
 */
class PayInPaymentDetailsDirectDebit extends Libraries\Dto implements PayInPaymentDetails
{
    /**
     * Direct debit type {SOFORT, ELV, GIROPAY}
     * @var string
     */
    public $DirectDebitType;
	    
     /**
      * Mandate Id
      * @var string
      */
     public $MandateId;
}

--- 
+++ 
@@ -17,4 +17,10 @@
       * @var string
       */
      public $MandateId;
+	 
+	 /**
+     * StatementDescriptor
+     * @var string
+     */
+     public $StatementDescriptor;
 }
Add StatementDescriptor field for direct debits

Closes #138
