IPN data can also be string

CRM/Core/Payment/MJWIPNTrait.php

@@ -64,7 +64,7 @@ trait CRM_Core_Payment_MJWIPNTrait {
   /**
    * The data provided by the IPN
    *
-   * @var array|Object
+   * @var array|Object|string
    */
   protected $data;
 
@@ -197,7 +197,7 @@ trait CRM_Core_Payment_MJWIPNTrait {
   }
 
   /**
-   * @param array|Object $data
+   * @param array|Object|string $data
    */
   public function setData($data) {
     $this->data = $data;