diff --git a/src/Handlers/PaymentHandlerLegacy.php b/src/Handlers/PaymentHandlerLegacy.php
index 879cb378..742f336d 100644
--- a/src/Handlers/PaymentHandlerLegacy.php
+++ b/src/Handlers/PaymentHandlerLegacy.php
@@ -65,7 +65,8 @@ public function pay(
                 $paymentCode,
                 $salesChannelId
             );
-            if ($fee > 0) {
+            $existingFee = (float) ($order->getCustomFieldsValue('buckarooFee') ?? 0.0);
+            if ($fee > 0 || $existingFee > 0) {
                 $this->asyncPaymentService
                     ->checkoutHelper
                     ->applyFeeToOrder($order->getId(), $fee, $salesChannelContext->getContext());
diff --git a/src/Handlers/PaymentHandlerModern.php b/src/Handlers/PaymentHandlerModern.php
index e3668d3a..92b8e715 100644
--- a/src/Handlers/PaymentHandlerModern.php
+++ b/src/Handlers/PaymentHandlerModern.php
@@ -97,7 +97,8 @@ public function pay(
                 $paymentCode,
                 $order->getSalesChannelId()
             );
-            if ($fee > 0) {
+            $existingFee = (float) ($order->getCustomFieldsValue('buckarooFee') ?? 0.0);
+            if ($fee > 0 || $existingFee > 0) {
                 $this->feeCalculator->applyFeeToOrder($order->getId(), $fee, $salesChannelContext->getContext());
                 // Reload order to get updated total
                 $reloadedOrder = $this->asyncPaymentService->checkoutHelper->getOrderById(
diff --git a/src/Handlers/PaymentHandlerSimple.php b/src/Handlers/PaymentHandlerSimple.php
index af1ffdac..103aa3ee 100644
--- a/src/Handlers/PaymentHandlerSimple.php
+++ b/src/Handlers/PaymentHandlerSimple.php
@@ -268,7 +268,8 @@ public function pay(
                     $paymentCode,
                     $salesChannelContext->getSalesChannelId()
                 );
-                if ($fee > 0) {
+                $existingFee = (float) ($order->getCustomFieldsValue('buckarooFee') ?? 0.0);
+                if ($fee > 0 || $existingFee > 0) {
                     $feeCalculator->applyFeeToOrder($order->getId(), $fee, $context);
                     // Reload order to get updated total
                     $order = $this->asyncPaymentService->checkoutHelper->getOrderById($order->getId(), $context);