diff --git a/src/Components/CardRepository/CardRepository.php b/src/Components/CardRepository/CardRepository.php
index fb4c3a92c..53a0fd38d 100644
--- a/src/Components/CardRepository/CardRepository.php
+++ b/src/Components/CardRepository/CardRepository.php
@@ -107,6 +107,9 @@ public function getExistingCard(
             new EqualsFilter('payone_payment_card.customerId', $customer->getId())
         );
 
-        return $this->cardRepository->search($criteria, $context)->first();
+        /** @var PayonePaymentCardEntity|null $card */
+        $card = $this->cardRepository->search($criteria, $context)->first();
+
+        return $card;
     }
 }
diff --git a/src/Components/Helper/OrderFetcher.php b/src/Components/Helper/OrderFetcher.php
index 0944d6b21..391a297d1 100644
--- a/src/Components/Helper/OrderFetcher.php
+++ b/src/Components/Helper/OrderFetcher.php
@@ -28,7 +28,10 @@ public function getOrderById(string $orderId, Context $context): ?OrderEntity
         $criteria = $this->getOrderCriteria();
         $criteria->addFilter(new EqualsFilter('id', $orderId));
 
-        return $this->orderRepository->search($criteria, $context)->first();
+        /** @var OrderEntity|null $order */
+        $order = $this->orderRepository->search($criteria, $context)->first();
+
+        return $order;
     }
 
     public function getOrderBillingAddress(OrderEntity $order): OrderAddressEntity
diff --git a/src/Components/KlarnaSessionService/KlarnaSessionService.php b/src/Components/KlarnaSessionService/KlarnaSessionService.php
index 3b6a8bee6..ac0949ade 100644
--- a/src/Components/KlarnaSessionService/KlarnaSessionService.php
+++ b/src/Components/KlarnaSessionService/KlarnaSessionService.php
@@ -10,6 +10,7 @@
 use PayonePayment\Payone\RequestParameter\Struct\KlarnaCreateSessionStruct;
 use PayonePayment\Storefront\Struct\CheckoutKlarnaSessionData;
 use Shopware\Core\Checkout\Cart\SalesChannel\CartService;
+use Shopware\Core\Checkout\Order\OrderEntity;
 use Shopware\Core\Framework\DataAbstractionLayer\EntityRepository;
 use Shopware\Core\System\SalesChannel\SalesChannelContext;
 
@@ -28,6 +29,7 @@ public function createKlarnaSession(SalesChannelContext $salesChannelContext, ?s
     {
         if ($orderId) {
             $orderCriteria = $this->cartHasher->getCriteriaForOrder($orderId);
+            /** @var OrderEntity|null $order */
             $order = $this->orderEntityRepository->search($orderCriteria, $salesChannelContext->getContext())->first();
         }
 
diff --git a/src/Components/MandateService/MandateService.php b/src/Components/MandateService/MandateService.php
index b534e4f9d..67f638d9a 100644
--- a/src/Components/MandateService/MandateService.php
+++ b/src/Components/MandateService/MandateService.php
@@ -117,6 +117,9 @@ protected function getExistingMandate(
             new EqualsFilter('customerId', $customer->getId())
         );
 
-        return $this->mandateRepository->search($criteria, $context)->first();
+        /** @var PayonePaymentMandateEntity|null $mandate */
+        $mandate = $this->mandateRepository->search($criteria, $context)->first();
+
+        return $mandate;
     }
 }
diff --git a/src/Components/TransactionHandler/AbstractTransactionHandler.php b/src/Components/TransactionHandler/AbstractTransactionHandler.php
index 061482f30..7811379c3 100644
--- a/src/Components/TransactionHandler/AbstractTransactionHandler.php
+++ b/src/Components/TransactionHandler/AbstractTransactionHandler.php
@@ -198,6 +198,9 @@ protected function getTransaction(string $transactionId): ?OrderTransactionEntit
         $criteria->addAssociation('order.deliveries');
         $criteria->addAssociation('paymentMethod');
 
-        return $this->transactionRepository->search($criteria, $this->context)->first();
+        /** @var OrderTransactionEntity|null $transaction */
+        $transaction = $this->transactionRepository->search($criteria, $this->context)->first();
+
+        return $transaction;
     }
 }
diff --git a/src/Controller/SettingsController.php b/src/Controller/SettingsController.php
index 2dc05073c..8da6a8902 100644
--- a/src/Controller/SettingsController.php
+++ b/src/Controller/SettingsController.php
@@ -51,7 +51,9 @@ public function validateApiCredentials(Request $request, Context $context): Json
             $criteria = (new Criteria())->addFilter(new EqualsFilter('handlerIdentifier', $paymentClass));
             $paymentMethod = $this->paymentMethodRepository->search($criteria, $context)->first();
 
-            if (!$paymentMethod || !$paymentMethod->getActive() || \in_array($paymentMethod->getHandlerIdentifier(), Handler\PaymentHandlerGroups::RATEPAY, true)) {
+            if (!$paymentMethod instanceof PaymentMethodEntity
+                || !$paymentMethod->getActive()
+                || \in_array($paymentMethod->getHandlerIdentifier(), Handler\PaymentHandlerGroups::RATEPAY, true)) {
                 continue;
             }
 
diff --git a/src/EventListener/CheckoutFinishEventListener.php b/src/EventListener/CheckoutFinishEventListener.php
index e0ee28aac..03790002f 100644
--- a/src/EventListener/CheckoutFinishEventListener.php
+++ b/src/EventListener/CheckoutFinishEventListener.php
@@ -80,7 +80,10 @@ private function getMandate(string $mandateIdentification, Context $context): ?P
         $criteria = new Criteria();
         $criteria->addFilter(new EqualsFilter('identification', $mandateIdentification));
 
-        return $this->mandateRepository->search($criteria, $context)->first();
+        /** @var PayonePaymentMandateEntity|null $mandate */
+        $mandate = $this->mandateRepository->search($criteria, $context)->first();
+
+        return $mandate;
     }
 
     private function getMandateIdentification(OrderEntity $order, Context $context): ?string
diff --git a/src/Installer/PaymentMethodInstaller.php b/src/Installer/PaymentMethodInstaller.php
index 156df8906..5b1f6b7c0 100644
--- a/src/Installer/PaymentMethodInstaller.php
+++ b/src/Installer/PaymentMethodInstaller.php
@@ -211,9 +211,12 @@ private function getPaymentMethods(): array
 
     private function findPaymentMethodEntity(string $id, Context $context): ?PaymentMethodEntity
     {
-        return $this->paymentMethodRepository
+        /** @var PaymentMethodEntity|null $paymentMethod */
+        $paymentMethod = $this->paymentMethodRepository
             ->search(new Criteria([$id]), $context)
             ->first();
+
+        return $paymentMethod;
     }
 
     private function upsertPaymentMethod(PaymentMethodInterface $paymentMethod, Context $context): void
diff --git a/src/Payone/RequestParameter/Builder/ApplePay/AuthorizeRequestParameterBuilder.php b/src/Payone/RequestParameter/Builder/ApplePay/AuthorizeRequestParameterBuilder.php
index 6418a6552..e86dab5d1 100644
--- a/src/Payone/RequestParameter/Builder/ApplePay/AuthorizeRequestParameterBuilder.php
+++ b/src/Payone/RequestParameter/Builder/ApplePay/AuthorizeRequestParameterBuilder.php
@@ -150,7 +150,10 @@ private function getOrderById(AbstractRequestParameterStruct $arguments): ?Order
         $criteria->addAssociation('addresses');
         $criteria->addAssociation('addresses.country');
 
-        return $this->orderRepository->search($criteria, $context)->first();
+        /** @var OrderEntity|null $order */
+        $order = $this->orderRepository->search($criteria, $context)->first();
+
+        return $order;
     }
 
     private function getCardType(ParameterBag $requestDataBag): string
diff --git a/src/Payone/RequestParameter/Builder/CustomerRequestParameterBuilder.php b/src/Payone/RequestParameter/Builder/CustomerRequestParameterBuilder.php
index 07a04c8b7..fccafff23 100644
--- a/src/Payone/RequestParameter/Builder/CustomerRequestParameterBuilder.php
+++ b/src/Payone/RequestParameter/Builder/CustomerRequestParameterBuilder.php
@@ -171,7 +171,7 @@ private function getCustomerSalutation(CustomerAddressEntity $addressEntity, Con
 
         $salutation = $this->salutationRepository->search($criteria, $context)->first();
 
-        if ($salutation === null) {
+        if (!$salutation instanceof SalutationEntity) {
             throw new \RuntimeException('missing order customer salutation');
         }
 
diff --git a/src/Storefront/Controller/Account/AccountOrderControllerDecorator.php b/src/Storefront/Controller/Account/AccountOrderControllerDecorator.php
index f6405ab36..a8b0ce724 100644
--- a/src/Storefront/Controller/Account/AccountOrderControllerDecorator.php
+++ b/src/Storefront/Controller/Account/AccountOrderControllerDecorator.php
@@ -5,6 +5,7 @@
 namespace PayonePayment\Storefront\Controller\Account;
 
 use PayonePayment\PaymentHandler\PaymentHandlerGroups;
+use Shopware\Core\Checkout\Order\OrderEntity;
 use Shopware\Core\Framework\Context;
 use Shopware\Core\Framework\DataAbstractionLayer\EntityRepository;
 use Shopware\Core\Framework\DataAbstractionLayer\Search\Criteria;
@@ -77,6 +78,7 @@ protected function isRatepayOrder(string $orderId, Context $context): bool
         $criteria = new Criteria([$orderId]);
         $criteria->addAssociation('transactions.paymentMethod');
 
+        /** @var OrderEntity|null $order */
         $order = $this->orderRepository->search($criteria, $context)->first();
 
         if ($order && $order->getTransactions()) {