diff --git a/src/Payum/LaravelPackage/Model/Payment.php b/src/Payum/LaravelPackage/Model/Payment.php
index 09bbd01..7004413 100644
--- a/src/Payum/LaravelPackage/Model/Payment.php
+++ b/src/Payum/LaravelPackage/Model/Payment.php
@@ -19,7 +19,7 @@ class Payment extends Model implements  PaymentInterface
      */
     public function setDetails($details)
     {
-        $this->setAttribute('details', json_encode($details ?: array()));
+        $this->setAttribute('details', json_encode($details ?: array(), JSON_PRESERVE_ZERO_FRACTION));
     }
 
     /**
@@ -141,4 +141,4 @@ public function setCreditCard(CreditCardInterface $creditCard = null)
     {
         $this->creditCard = $creditCard;
     }
-}
\ No newline at end of file
+}