diff --git a/backend/src/main/java/de/szut/casino/deposit/DepositController.java b/backend/src/main/java/de/szut/casino/deposit/DepositController.java
index b2918cf..62ab40a 100644
--- a/backend/src/main/java/de/szut/casino/deposit/DepositController.java
+++ b/backend/src/main/java/de/szut/casino/deposit/DepositController.java
@@ -52,10 +52,14 @@ public class DepositController {
 
         SessionCreateParams params = SessionCreateParams.builder()
                 .addLineItem(SessionCreateParams.LineItem.builder()
-                        .setAmount((long) amountDto.getAmount() * 100)
-                        .setCurrency("EUR")
+                        .setPriceData(SessionCreateParams.LineItem.PriceData.builder()
+                                .setCurrency("EUR")
+                                .setUnitAmount((long) amountDto.getAmount() * 100)
+                                .setProductData(SessionCreateParams.LineItem.PriceData.ProductData.builder()
+                                        .setName("Einzahlung")
+                                        .build())
+                                .build())
                         .setQuantity(1L)
-                        .setName("Einzahlung")
                         .build())
                 .setSuccessUrl(frontendHost+"/home?success=true")
                 .setCancelUrl(frontendHost+"/home?success=false")
diff --git a/backend/src/main/java/de/szut/casino/deposit/TransactionService.java b/backend/src/main/java/de/szut/casino/deposit/TransactionService.java
index 24d4382..f20735a 100644
--- a/backend/src/main/java/de/szut/casino/deposit/TransactionService.java
+++ b/backend/src/main/java/de/szut/casino/deposit/TransactionService.java
@@ -40,7 +40,7 @@ public class TransactionService {
                 .build();
         Session checkoutSession = Session.retrieve(sessionID, params, null);
 
-        if (!Objects.equals(checkoutSession.getPaymentStatus(), "paid")) {
+        if (!"paid".equals(checkoutSession.getPaymentStatus())) {
             return;
         }
 
@@ -53,10 +53,12 @@ public class TransactionService {
         transaction.setStatus(TransactionStatus.SUCCEEDED);
 
         UserEntity user = transaction.getUser();
-        user.addBalance(checkoutSession.getAmountTotal());
+        Long amountTotal = checkoutSession.getAmountTotal();
+        if (amountTotal != null) {
+            user.addBalance(amountTotal);
+        }
 
         userRepository.save(user);
         transactionRepository.save(transaction);
     }
-
-}
+}
\ No newline at end of file
diff --git a/backend/src/main/java/de/szut/casino/deposit/WebhookController.java b/backend/src/main/java/de/szut/casino/deposit/WebhookController.java
index 3bcf699..134e1ad 100644
--- a/backend/src/main/java/de/szut/casino/deposit/WebhookController.java
+++ b/backend/src/main/java/de/szut/casino/deposit/WebhookController.java
@@ -51,14 +51,20 @@ public class WebhookController {
         switch (event.getType()) {
             case "checkout.session.completed":
             case "checkout.session.async_payment_succeeded":
-                Session session = (Session) event.getData().getObject();
-
-                this.transactionService.fulfillCheckout(session.getId());
+                EventDataObjectDeserializer dataObjectDeserializer = event.getDataObjectDeserializer();
+                
+                if (dataObjectDeserializer.getObject().isPresent()) {
+                    Session session = (Session) dataObjectDeserializer.getObject().get();
+                    this.transactionService.fulfillCheckout(session.getId());
+                } else {
+                    logger.error("Failed to deserialize webhook event data");
+                }
                 break;
             default:
-
+                // No action needed for other event types
+                break;
         }
 
         return ResponseEntity.ok().body(null);
     }
-}
+}
\ No newline at end of file