diff --git a/src/Message/UpdateCustomerRequest.php b/src/Message/UpdateCustomerRequest.php
index a3331518..d05cf8c9 100644
--- a/src/Message/UpdateCustomerRequest.php
+++ b/src/Message/UpdateCustomerRequest.php
@@ -57,6 +57,27 @@ public function setEmail($value)
         return $this->setParameter('email', $value);
     }
 
+    /**
+     * Get the customer's source.
+     *
+     * @return string
+     */
+    public function getSource()
+    {
+        return $this->getParameter('source');
+    }
+    
+    /**
+     * Sets the customer's source.
+     *
+     * @param string $value
+     * @return CreateCustomerRequest provides a fluent interface.
+     */
+    public function setSource($value)
+    {
+        $this->setParameter('source', $value);
+    }
+
     public function getData()
     {
         $this->validate('customerReference');
@@ -77,6 +98,10 @@ public function getData()
             $data['metadata'] = $this->getMetadata();
         }
 
+        if ($this->getSource()) {
+            $data['source'] = $this->getSource();
+        }
+
         return $data;
     }