diff --git a/src/Payment/PaymentService.php b/src/Payment/PaymentService.php
index ea7b53f3..64a38905 100644
--- a/src/Payment/PaymentService.php
+++ b/src/Payment/PaymentService.php
@@ -484,7 +484,7 @@ protected function processAsMolliePayment(
                     : '',
             ];
 
-            $this->logger->debug($apiCallLog);
+            $this->logger->debug(json_encode($apiCallLog));
 
             // Try as simple payment
             $paymentObject = $this->apiHelper->getApiClient(