Merge pull request #105 from phpguru/issue/104-getcustomerreefrence-on-charge-object

Return customer reference for charge objects - Issue 104

Author: barryvdh

src/Message/Response.php

@@ -114,6 +114,11 @@ public function getCustomerReference()
                 return $this->data['customer'];
             }
         }
+        if (isset($this->data['object']) && 'charge' === $this->data['object']) {
+            if (!empty($this->data['customer'])) {
+                return $this->data['customer'];
+            }
+        }
 
         return null;
     }