diff --git a/src/PaymentMethods/iDeal/Models/Pay.php b/src/PaymentMethods/iDeal/Models/Pay.php
index da7304ea..5c0ed0ee 100644
--- a/src/PaymentMethods/iDeal/Models/Pay.php
+++ b/src/PaymentMethods/iDeal/Models/Pay.php
@@ -25,4 +25,5 @@
 class Pay extends ServiceParameter
 {
     protected string $issuer;
+    protected string $shippingCost;
 }
diff --git a/tests/Buckaroo/Payments/IdealTest.php b/tests/Buckaroo/Payments/IdealTest.php
index c0d3508c..445192bb 100644
--- a/tests/Buckaroo/Payments/IdealTest.php
+++ b/tests/Buckaroo/Payments/IdealTest.php
@@ -100,6 +100,7 @@ public function it_creates_a_ideal_fast_checkout_payment()
     {
         $response = $this->buckaroo->method('ideal')->payFastCheckout([
             'amountDebit'    => 10.10,
+            'shippingCost'   => 0.10,
             'invoice'   => uniqid(),
         ]);