diff --git a/src/DataTypes/Customer.php b/src/DataTypes/Customer.php
new file mode 100644
index 0000000..9c40537
--- /dev/null
+++ b/src/DataTypes/Customer.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace CommerceGuys\AuthNet\DataTypes;
+
+class Customer extends BaseDataType
+{
+    protected $propertyMap = [
+        'type',
+        'id',
+        'email',
+        'driversLicense',
+        'taxId',
+    ];
+}
\ No newline at end of file
diff --git a/tests/CreateTransactionRequest/CreateTransactionRequestTestBase.php b/tests/CreateTransactionRequest/CreateTransactionRequestTestBase.php
index cf55531..e5162bf 100644
--- a/tests/CreateTransactionRequest/CreateTransactionRequestTestBase.php
+++ b/tests/CreateTransactionRequest/CreateTransactionRequestTestBase.php
@@ -6,6 +6,7 @@
 use CommerceGuys\AuthNet\DataTypes\Order;
 use CommerceGuys\AuthNet\DataTypes\CreditCard;
 use CommerceGuys\AuthNet\DataTypes\BankAccount;
+use CommerceGuys\AuthNet\DataTypes\Customer;
 use CommerceGuys\AuthNet\DataTypes\TransactionRequest;
 
 abstract class CreateTransactionRequestTestBase extends TestBase {
@@ -31,6 +32,9 @@ protected function createChargableTransactionRequest($type, $cardNum = '41111111
     $transactionRequest->addOrder(new Order([
       'invoiceNumber' => 'INV-' . rand(10, 100),
     ]));
+    $transactionRequest->addDataType(new Customer([
+      'email' => 'bojangles@example.net',
+  ]));
 
     return $transactionRequest;
   }
diff --git a/tests/CreateTransactionRequest/RefundTest.php b/tests/CreateTransactionRequest/RefundTest.php
index ae1e834..7dac112 100644
--- a/tests/CreateTransactionRequest/RefundTest.php
+++ b/tests/CreateTransactionRequest/RefundTest.php
@@ -3,8 +3,10 @@
 namespace CommerceGuys\AuthNet\Tests\CreateTransactionRequest;
 
 use CommerceGuys\AuthNet\DataTypes\CreditCard;
+use CommerceGuys\AuthNet\DataTypes\Customer;
 use CommerceGuys\AuthNet\DataTypes\TransactionRequest;
 
+
 class RefundTest extends CreateTransactionRequestTestBase
 {
 
@@ -31,6 +33,9 @@ public function testRefundTransaction()
             'cardNumber' => 'XXXX1111',
             'expirationDate' => 'XXXX',
         ]));
+        $transactionRequest->addDataType(new Customer([
+            'email' => 'bojangles@example.net',
+        ]));
 
         sleep(4);
         $this->assertTrue(isset($response->transactionResponse));