diff --git a/UPGRADE-API-2.0.md b/UPGRADE-API-2.0.md
index 6641f0fff0..564cb749d9 100644
--- a/UPGRADE-API-2.0.md
+++ b/UPGRADE-API-2.0.md
@@ -1,3 +1,22 @@
+# UPGRADE FROM `2.0.17` TO `2.0.18`
+
+## Security
+
+### Payment request ownership enforcement
+
+`GET /api/v2/shop/payment-requests/{hash}` and `PUT /api/v2/shop/payment-requests/{hash}` now enforce ownership:
+
+- An unauthenticated request receives `404 Not Found`, unless the underlying order is a guest order (its customer has no associated user account).
+- An authenticated shop user can only access payment requests belonging to their own orders; requests for another customer's payment request also receive `404 Not Found`.
+
+Previously both operations could be performed by any authenticated user or even an anonymous user who knew the payment request hash, which constituted a broken object-level authorization (IDOR) vulnerability.
+
+**No action is required** unless your integration assumed that these endpoints were publicly accessible or shared across customers.
+
+### `Sylius\Bundle\ApiBundle\StateProvider\Shop\Payment\PaymentRequest\ItemProvider` constructor
+
+A new `UserContextInterface` argument is appended to the constructor. Omitting it is deprecated and will be required in Sylius 3.0; without it the ownership check is skipped and the provider falls back to its previous behavior.
+
 # UPGRADE FROM `1.14` TO `2.0`
 
 ## Codebase
diff --git a/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtension.php b/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtension.php
new file mode 100644
index 0000000000..fdd04cdef7
--- /dev/null
+++ b/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtension.php
@@ -0,0 +1,93 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest;
+
+use ApiPlatform\Doctrine\Orm\Extension\QueryCollectionExtensionInterface;
+use ApiPlatform\Doctrine\Orm\Extension\QueryItemExtensionInterface;
+use ApiPlatform\Doctrine\Orm\Util\QueryNameGeneratorInterface;
+use ApiPlatform\Metadata\Operation;
+use Doctrine\ORM\QueryBuilder;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
+use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
+use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
+use Sylius\Component\Core\Model\ShopUserInterface;
+use Sylius\Component\Payment\Model\PaymentRequestInterface;
+
+final readonly class ShopUserBasedExtension implements QueryCollectionExtensionInterface, QueryItemExtensionInterface
+{
+    public function __construct(
+        private SectionProviderInterface $sectionProvider,
+        private UserContextInterface $userContext,
+    ) {
+    }
+
+    /**
+     * @param array<array-key, mixed> $context
+     */
+    public function applyToCollection(
+        QueryBuilder $queryBuilder,
+        QueryNameGeneratorInterface $queryNameGenerator,
+        string $resourceClass,
+        ?Operation $operation = null,
+        array $context = [],
+    ): void {
+        $this->filterByCustomer($queryBuilder, $queryNameGenerator, $resourceClass);
+    }
+
+    /**
+     * @param array<array-key, mixed> $identifiers
+     * @param array<array-key, mixed> $context
+     */
+    public function applyToItem(
+        QueryBuilder $queryBuilder,
+        QueryNameGeneratorInterface $queryNameGenerator,
+        string $resourceClass,
+        array $identifiers,
+        ?Operation $operation = null,
+        array $context = [],
+    ): void {
+        $this->filterByCustomer($queryBuilder, $queryNameGenerator, $resourceClass);
+    }
+
+    private function filterByCustomer(
+        QueryBuilder $queryBuilder,
+        QueryNameGeneratorInterface $queryNameGenerator,
+        string $resourceClass,
+    ): void {
+        if (!is_a($resourceClass, PaymentRequestInterface::class, true)) {
+            return;
+        }
+
+        if (!$this->sectionProvider->getSection() instanceof ShopApiSection) {
+            return;
+        }
+
+        $user = $this->userContext->getUser();
+        if (!$user instanceof ShopUserInterface) {
+            return;
+        }
+
+        $rootAlias = $queryBuilder->getRootAliases()[0];
+        $paymentJoinAlias = $queryNameGenerator->generateJoinAlias('payment');
+        $orderJoinAlias = $queryNameGenerator->generateJoinAlias('order');
+        $customerParameterName = $queryNameGenerator->generateParameterName('customer');
+
+        $queryBuilder
+            ->innerJoin(sprintf('%s.payment', $rootAlias), $paymentJoinAlias)
+            ->innerJoin(sprintf('%s.order', $paymentJoinAlias), $orderJoinAlias)
+            ->andWhere($queryBuilder->expr()->eq(sprintf('%s.customer', $orderJoinAlias), sprintf(':%s', $customerParameterName)))
+            ->setParameter($customerParameterName, $user->getCustomer())
+        ;
+    }
+}
diff --git a/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtension.php b/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtension.php
new file mode 100644
index 0000000000..89e4f7b146
--- /dev/null
+++ b/src/Sylius/Bundle/ApiBundle/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtension.php
@@ -0,0 +1,76 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest;
+
+use ApiPlatform\Doctrine\Orm\Extension\QueryItemExtensionInterface;
+use ApiPlatform\Doctrine\Orm\Util\QueryNameGeneratorInterface;
+use ApiPlatform\Metadata\Operation;
+use Doctrine\ORM\QueryBuilder;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
+use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
+use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
+use Sylius\Component\Payment\Model\PaymentRequestInterface;
+
+final readonly class VisitorBasedExtension implements QueryItemExtensionInterface
+{
+    public function __construct(
+        private SectionProviderInterface $sectionProvider,
+        private UserContextInterface $userContext,
+    ) {
+    }
+
+    /**
+     * @param array<array-key, mixed> $identifiers
+     * @param array<array-key, mixed> $context
+     */
+    public function applyToItem(
+        QueryBuilder $queryBuilder,
+        QueryNameGeneratorInterface $queryNameGenerator,
+        string $resourceClass,
+        array $identifiers,
+        ?Operation $operation = null,
+        array $context = [],
+    ): void {
+        if (!is_a($resourceClass, PaymentRequestInterface::class, true)) {
+            return;
+        }
+
+        if (!$this->sectionProvider->getSection() instanceof ShopApiSection) {
+            return;
+        }
+
+        if (null !== $this->userContext->getUser()) {
+            return;
+        }
+
+        $rootAlias = $queryBuilder->getRootAliases()[0];
+        $paymentJoinAlias = $queryNameGenerator->generateJoinAlias('payment');
+        $orderJoinAlias = $queryNameGenerator->generateJoinAlias('order');
+        $customerJoinAlias = $queryNameGenerator->generateJoinAlias('customer');
+        $userJoinAlias = $queryNameGenerator->generateJoinAlias('user');
+
+        $queryBuilder
+            ->innerJoin(sprintf('%s.payment', $rootAlias), $paymentJoinAlias)
+            ->innerJoin(sprintf('%s.order', $paymentJoinAlias), $orderJoinAlias)
+            ->leftJoin(sprintf('%s.customer', $orderJoinAlias), $customerJoinAlias)
+            ->leftJoin(sprintf('%s.user', $customerJoinAlias), $userJoinAlias)
+            ->andWhere(
+                $queryBuilder->expr()->orX(
+                    $queryBuilder->expr()->isNull($customerJoinAlias),
+                    $queryBuilder->expr()->isNull($userJoinAlias),
+                ),
+            )
+        ;
+    }
+}
diff --git a/src/Sylius/Bundle/ApiBundle/Resources/config/services/extensions.xml b/src/Sylius/Bundle/ApiBundle/Resources/config/services/extensions.xml
index 9225d609f6..829c988a0b 100644
--- a/src/Sylius/Bundle/ApiBundle/Resources/config/services/extensions.xml
+++ b/src/Sylius/Bundle/ApiBundle/Resources/config/services/extensions.xml
@@ -280,5 +280,24 @@
             <tag name="api_platform.doctrine.orm.query_extension.collection" />
             <tag name="api_platform.doctrine.orm.query_extension.item" />
         </service>
+
+        <service
+            id="sylius_api.doctrine.orm.query_extension.shop.payment_request.shop_user_based"
+            class="Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest\ShopUserBasedExtension"
+        >
+            <argument type="service" id="sylius.section_resolver.uri_based" />
+            <argument type="service" id="sylius_api.context.user.token_based" />
+            <tag name="api_platform.doctrine.orm.query_extension.collection" />
+            <tag name="api_platform.doctrine.orm.query_extension.item" />
+        </service>
+
+        <service
+            id="sylius_api.doctrine.orm.query_extension.shop.payment_request.visitor_based"
+            class="Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest\VisitorBasedExtension"
+        >
+            <argument type="service" id="sylius.section_resolver.uri_based" />
+            <argument type="service" id="sylius_api.context.user.token_based" />
+            <tag name="api_platform.doctrine.orm.query_extension.item" />
+        </service>
     </services>
 </container>
diff --git a/src/Sylius/Bundle/ApiBundle/Resources/config/services/shop/state_providers.xml b/src/Sylius/Bundle/ApiBundle/Resources/config/services/shop/state_providers.xml
index 4a7b7fe95d..c716f6ab33 100644
--- a/src/Sylius/Bundle/ApiBundle/Resources/config/services/shop/state_providers.xml
+++ b/src/Sylius/Bundle/ApiBundle/Resources/config/services/shop/state_providers.xml
@@ -76,6 +76,7 @@
             <argument type="service" id="sylius.section_resolver.uri_based" />
             <argument type="service" id="sylius.repository.payment_request"/>
             <argument type="service" id="sylius.checker.finalized_payment_request"/>
+            <argument type="service" id="sylius_api.context.user.token_based" />
             <tag name="api_platform.state_provider" priority="10"/>
         </service>
     </services>
diff --git a/src/Sylius/Bundle/ApiBundle/StateProvider/Shop/Payment/PaymentRequest/ItemProvider.php b/src/Sylius/Bundle/ApiBundle/StateProvider/Shop/Payment/PaymentRequest/ItemProvider.php
index a7334e20ae..42254e5685 100644
--- a/src/Sylius/Bundle/ApiBundle/StateProvider/Shop/Payment/PaymentRequest/ItemProvider.php
+++ b/src/Sylius/Bundle/ApiBundle/StateProvider/Shop/Payment/PaymentRequest/ItemProvider.php
@@ -16,9 +16,14 @@ namespace Sylius\Bundle\ApiBundle\StateProvider\Shop\Payment\PaymentRequest;
 use ApiPlatform\Metadata\Operation;
 use ApiPlatform\Metadata\Put;
 use ApiPlatform\State\ProviderInterface;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
 use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
 use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
 use Sylius\Bundle\PaymentBundle\Checker\FinalizedPaymentRequestCheckerInterface;
+use Sylius\Component\Core\Model\CustomerInterface;
+use Sylius\Component\Core\Model\OrderInterface;
+use Sylius\Component\Core\Model\PaymentInterface;
+use Sylius\Component\Core\Model\ShopUserInterface;
 use Sylius\Component\Payment\Model\PaymentRequestInterface;
 use Sylius\Component\Payment\Repository\PaymentRequestRepositoryInterface;
 use Webmozart\Assert\Assert;
@@ -35,7 +40,17 @@ final readonly class ItemProvider implements ProviderInterface
         private SectionProviderInterface $sectionProvider,
         private PaymentRequestRepositoryInterface $paymentRequestRepository,
         private FinalizedPaymentRequestCheckerInterface $finalizedPaymentRequestChecker,
+        private ?UserContextInterface $userContext = null,
     ) {
+        if ($userContext === null) {
+            trigger_deprecation(
+                'sylius/api-bundle',
+                '2.2',
+                'Not passing a "%s" to the "%s" constructor is deprecated and will be required in Sylius 3.0.',
+                UserContextInterface::class,
+                self::class,
+            );
+        }
     }
 
     public function provide(Operation $operation, array $uriVariables = [], array $context = []): array|object|null
@@ -45,14 +60,60 @@ final readonly class ItemProvider implements ProviderInterface
         Assert::isInstanceOf($this->sectionProvider->getSection(), ShopApiSection::class);
 
         $paymentRequest = $this->paymentRequestRepository->find($uriVariables['hash']);
+        if (null === $paymentRequest) {
+            return null;
+        }
 
-        if (
-            $paymentRequest === null ||
-            $this->finalizedPaymentRequestChecker->isFinal($paymentRequest)
-        ) {
+        if ($this->userContext !== null && !$this->isAccessibleByCurrentUser($paymentRequest)) {
+            return null;
+        }
+
+        if ($this->finalizedPaymentRequestChecker->isFinal($paymentRequest)) {
             return null;
         }
 
         return $paymentRequest;
     }
+
+    private function isAccessibleByCurrentUser(PaymentRequestInterface $paymentRequest): bool
+    {
+        $user = $this->userContext->getUser();
+
+        if ($user instanceof ShopUserInterface) {
+            $customer = $user->getCustomer();
+
+            return $customer instanceof CustomerInterface && $this->isOwnedByCustomer($paymentRequest, $customer);
+        }
+
+        return $this->isGuestOrder($paymentRequest);
+    }
+
+    private function isOwnedByCustomer(PaymentRequestInterface $paymentRequest, CustomerInterface $customer): bool
+    {
+        $payment = $paymentRequest->getPayment();
+        if (!$payment instanceof PaymentInterface) {
+            return false;
+        }
+
+        $order = $payment->getOrder();
+
+        return $order instanceof OrderInterface && $order->getCustomer() === $customer;
+    }
+
+    private function isGuestOrder(PaymentRequestInterface $paymentRequest): bool
+    {
+        $payment = $paymentRequest->getPayment();
+        if (!$payment instanceof PaymentInterface) {
+            return false;
+        }
+
+        $order = $payment->getOrder();
+        if (!$order instanceof OrderInterface) {
+            return false;
+        }
+
+        $customer = $order->getCustomer();
+
+        return null === $customer || null === $customer->getUser();
+    }
 }
diff --git a/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtensionTest.php b/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtensionTest.php
new file mode 100644
index 0000000000..ba3c3aa388
--- /dev/null
+++ b/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/ShopUserBasedExtensionTest.php
@@ -0,0 +1,246 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Tests\Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest;
+
+use ApiPlatform\Doctrine\Orm\Util\QueryNameGeneratorInterface;
+use ApiPlatform\Metadata\Get;
+use Doctrine\ORM\Query\Expr;
+use Doctrine\ORM\Query\Expr\Comparison;
+use Doctrine\ORM\QueryBuilder;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
+use Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest\ShopUserBasedExtension;
+use Sylius\Bundle\ApiBundle\SectionResolver\AdminApiSection;
+use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
+use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
+use Sylius\Component\Core\Model\AdminUserInterface;
+use Sylius\Component\Core\Model\CustomerInterface;
+use Sylius\Component\Core\Model\ShopUserInterface;
+use Sylius\Component\Payment\Model\PaymentRequestInterface;
+use Sylius\Resource\Model\ResourceInterface;
+
+final class ShopUserBasedExtensionTest extends TestCase
+{
+    private ShopUserBasedExtension $extension;
+
+    private MockObject&SectionProviderInterface $sectionProvider;
+
+    private MockObject&UserContextInterface $userContext;
+
+    protected function setUp(): void
+    {
+        $this->sectionProvider = $this->createMock(SectionProviderInterface::class);
+        $this->userContext = $this->createMock(UserContextInterface::class);
+        $this->extension = new ShopUserBasedExtension($this->sectionProvider, $this->userContext);
+    }
+
+    public function test_does_not_apply_conditions_to_collection_for_unsupported_resource(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToCollection($queryBuilder, $nameGenerator, ResourceInterface::class, new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_collection_for_admin_api_section(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $section = $this->createMock(AdminApiSection::class);
+
+        $this->sectionProvider->method('getSection')->willReturn($section);
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToCollection($queryBuilder, $nameGenerator, PaymentRequestInterface::class, new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_collection_for_anonymous_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn(null);
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToCollection($queryBuilder, $nameGenerator, PaymentRequestInterface::class, new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_collection_for_non_shop_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $user = $this->createMock(AdminUserInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn($user);
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToCollection($queryBuilder, $nameGenerator, PaymentRequestInterface::class, new Get());
+    }
+
+    public function test_applies_conditions_to_collection(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $user = $this->createMock(ShopUserInterface::class);
+        $customer = $this->createMock(CustomerInterface::class);
+        $expr = $this->createMock(Expr::class);
+        $exprEq = $this->createMock(Comparison::class);
+
+        $user->method('getCustomer')->willReturn($customer);
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn($user);
+
+        $queryBuilder->expects($this->once())->method('getRootAliases')->willReturn(['o']);
+
+        $nameGenerator->expects($this->exactly(2))
+            ->method('generateJoinAlias')
+            ->willReturnCallback(fn (string $alias) => $alias);
+        $nameGenerator->expects($this->once())
+            ->method('generateParameterName')
+            ->with('customer')
+            ->willReturn('customer');
+
+        $queryBuilder->expects($this->exactly(2))
+            ->method('innerJoin')
+            ->willReturnCallback(function (string $join, string $alias) use ($queryBuilder): QueryBuilder {
+                static $calls = 0;
+                ++$calls;
+                if (1 === $calls) {
+                    self::assertSame('o.payment', $join);
+                    self::assertSame('payment', $alias);
+                } else {
+                    self::assertSame('payment.order', $join);
+                    self::assertSame('order', $alias);
+                }
+
+                return $queryBuilder;
+            });
+
+        $queryBuilder->expects($this->once())->method('expr')->willReturn($expr);
+        $expr->expects($this->once())->method('eq')->with('order.customer', ':customer')->willReturn($exprEq);
+
+        $queryBuilder->expects($this->once())->method('andWhere')->with($exprEq)->willReturn($queryBuilder);
+        $queryBuilder->expects($this->once())->method('setParameter')->with('customer', $customer)->willReturn($queryBuilder);
+
+        $this->extension->applyToCollection($queryBuilder, $nameGenerator, PaymentRequestInterface::class, new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_item_for_unsupported_resource(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, ResourceInterface::class, [], new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_item_for_admin_api_section(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $section = $this->createMock(AdminApiSection::class);
+
+        $this->sectionProvider->method('getSection')->willReturn($section);
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_item_for_anonymous_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn(null);
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+
+    public function test_does_not_apply_conditions_to_item_for_non_shop_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $user = $this->createMock(AdminUserInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn($user);
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+        $queryBuilder->expects($this->never())->method('andWhere');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+
+    public function test_applies_conditions_to_item(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $user = $this->createMock(ShopUserInterface::class);
+        $customer = $this->createMock(CustomerInterface::class);
+        $expr = $this->createMock(Expr::class);
+        $exprEq = $this->createMock(Comparison::class);
+
+        $user->method('getCustomer')->willReturn($customer);
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn($user);
+
+        $queryBuilder->expects($this->once())->method('getRootAliases')->willReturn(['o']);
+
+        $nameGenerator->expects($this->exactly(2))
+            ->method('generateJoinAlias')
+            ->willReturnCallback(fn (string $alias) => $alias);
+        $nameGenerator->expects($this->once())
+            ->method('generateParameterName')
+            ->with('customer')
+            ->willReturn('customer');
+
+        $queryBuilder->expects($this->exactly(2))
+            ->method('innerJoin')
+            ->willReturnCallback(function (string $join, string $alias) use ($queryBuilder): QueryBuilder {
+                static $calls = 0;
+                ++$calls;
+                if (1 === $calls) {
+                    self::assertSame('o.payment', $join);
+                    self::assertSame('payment', $alias);
+                } else {
+                    self::assertSame('payment.order', $join);
+                    self::assertSame('order', $alias);
+                }
+
+                return $queryBuilder;
+            });
+
+        $queryBuilder->expects($this->once())->method('expr')->willReturn($expr);
+        $expr->expects($this->once())->method('eq')->with('order.customer', ':customer')->willReturn($exprEq);
+
+        $queryBuilder->expects($this->once())->method('andWhere')->with($exprEq)->willReturn($queryBuilder);
+        $queryBuilder->expects($this->once())->method('setParameter')->with('customer', $customer)->willReturn($queryBuilder);
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+}
diff --git a/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtensionTest.php b/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtensionTest.php
new file mode 100644
index 0000000000..7fa25c0c46
--- /dev/null
+++ b/src/Sylius/Bundle/ApiBundle/tests/Doctrine/ORM/QueryExtension/Shop/PaymentRequest/VisitorBasedExtensionTest.php
@@ -0,0 +1,140 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Tests\Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest;
+
+use ApiPlatform\Doctrine\Orm\Util\QueryNameGeneratorInterface;
+use ApiPlatform\Metadata\Get;
+use Doctrine\ORM\Query\Expr;
+use Doctrine\ORM\Query\Expr\Orx;
+use Doctrine\ORM\QueryBuilder;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
+use Sylius\Bundle\ApiBundle\Doctrine\ORM\QueryExtension\Shop\PaymentRequest\VisitorBasedExtension;
+use Sylius\Bundle\ApiBundle\SectionResolver\AdminApiSection;
+use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
+use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
+use Sylius\Component\Core\Model\ShopUserInterface;
+use Sylius\Component\Payment\Model\PaymentRequestInterface;
+use Sylius\Resource\Model\ResourceInterface;
+
+final class VisitorBasedExtensionTest extends TestCase
+{
+    private VisitorBasedExtension $extension;
+
+    private MockObject&SectionProviderInterface $sectionProvider;
+
+    private MockObject&UserContextInterface $userContext;
+
+    protected function setUp(): void
+    {
+        $this->sectionProvider = $this->createMock(SectionProviderInterface::class);
+        $this->userContext = $this->createMock(UserContextInterface::class);
+        $this->extension = new VisitorBasedExtension($this->sectionProvider, $this->userContext);
+    }
+
+    public function test_does_not_apply_conditions_for_unsupported_resource(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, ResourceInterface::class, [], new Get());
+    }
+
+    public function test_does_not_apply_conditions_for_admin_section(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new AdminApiSection());
+        $this->userContext->expects($this->never())->method('getUser');
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+
+    public function test_does_not_apply_conditions_for_authenticated_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn($this->createMock(ShopUserInterface::class));
+        $queryBuilder->expects($this->never())->method('getRootAliases');
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+
+    public function test_applies_guest_order_filter_for_anonymous_user(): void
+    {
+        $queryBuilder = $this->createMock(QueryBuilder::class);
+        $nameGenerator = $this->createMock(QueryNameGeneratorInterface::class);
+        $expr = $this->createMock(Expr::class);
+        $orX = $this->createMock(Orx::class);
+
+        $this->sectionProvider->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->method('getUser')->willReturn(null);
+
+        $queryBuilder->expects($this->once())->method('getRootAliases')->willReturn(['o']);
+
+        $nameGenerator->expects($this->exactly(4))
+            ->method('generateJoinAlias')
+            ->willReturnCallback(fn (string $alias) => $alias);
+
+        $queryBuilder->expects($this->exactly(2))
+            ->method('innerJoin')
+            ->willReturnCallback(function (string $join, string $alias) use ($queryBuilder): QueryBuilder {
+                static $calls = 0;
+                ++$calls;
+                if (1 === $calls) {
+                    self::assertSame('o.payment', $join);
+                    self::assertSame('payment', $alias);
+                } else {
+                    self::assertSame('payment.order', $join);
+                    self::assertSame('order', $alias);
+                }
+
+                return $queryBuilder;
+            });
+
+        $queryBuilder->expects($this->exactly(2))
+            ->method('leftJoin')
+            ->willReturnCallback(function (string $join, string $alias) use ($queryBuilder): QueryBuilder {
+                static $calls = 0;
+                ++$calls;
+                if (1 === $calls) {
+                    self::assertSame('order.customer', $join);
+                    self::assertSame('customer', $alias);
+                } else {
+                    self::assertSame('customer.user', $join);
+                    self::assertSame('user', $alias);
+                }
+
+                return $queryBuilder;
+            });
+
+        $queryBuilder->expects($this->exactly(3))->method('expr')->willReturn($expr);
+        $expr->expects($this->exactly(2))
+            ->method('isNull')
+            ->willReturnCallback(fn (string $alias) => $alias . ' IS NULL');
+        $expr->expects($this->once())->method('orX')->with('customer IS NULL', 'user IS NULL')->willReturn($orX);
+
+        $queryBuilder->expects($this->once())->method('andWhere')->with($orX)->willReturn($queryBuilder);
+
+        $this->extension->applyToItem($queryBuilder, $nameGenerator, PaymentRequestInterface::class, [], new Get());
+    }
+}
diff --git a/src/Sylius/Bundle/ApiBundle/tests/StateProvider/Shop/Payment/PaymentRequest/ItemProviderTest.php b/src/Sylius/Bundle/ApiBundle/tests/StateProvider/Shop/Payment/PaymentRequest/ItemProviderTest.php
new file mode 100644
index 0000000000..6e70efa4c4
--- /dev/null
+++ b/src/Sylius/Bundle/ApiBundle/tests/StateProvider/Shop/Payment/PaymentRequest/ItemProviderTest.php
@@ -0,0 +1,224 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Tests\Sylius\Bundle\ApiBundle\StateProvider\Shop\Payment\PaymentRequest;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\Metadata\Put;
+use ApiPlatform\State\ProviderInterface;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Sylius\Bundle\ApiBundle\Context\UserContextInterface;
+use Sylius\Bundle\ApiBundle\SectionResolver\AdminApiSection;
+use Sylius\Bundle\ApiBundle\SectionResolver\ShopApiSection;
+use Sylius\Bundle\ApiBundle\StateProvider\Shop\Payment\PaymentRequest\ItemProvider;
+use Sylius\Bundle\CoreBundle\SectionResolver\SectionProviderInterface;
+use Sylius\Bundle\PaymentBundle\Checker\FinalizedPaymentRequestCheckerInterface;
+use Sylius\Component\Core\Model\CustomerInterface;
+use Sylius\Component\Core\Model\OrderInterface;
+use Sylius\Component\Core\Model\PaymentInterface;
+use Sylius\Component\Core\Model\ShopUserInterface;
+use Sylius\Component\Payment\Model\PaymentRequestInterface;
+use Sylius\Component\Payment\Repository\PaymentRequestRepositoryInterface;
+
+final class ItemProviderTest extends TestCase
+{
+    private MockObject&SectionProviderInterface $sectionProvider;
+
+    private MockObject&UserContextInterface $userContext;
+
+    private MockObject&PaymentRequestRepositoryInterface $paymentRequestRepository;
+
+    private FinalizedPaymentRequestCheckerInterface&MockObject $finalizedPaymentRequestChecker;
+
+    private ItemProvider $itemProvider;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->sectionProvider = $this->createMock(SectionProviderInterface::class);
+        $this->userContext = $this->createMock(UserContextInterface::class);
+        $this->paymentRequestRepository = $this->createMock(PaymentRequestRepositoryInterface::class);
+        $this->finalizedPaymentRequestChecker = $this->createMock(FinalizedPaymentRequestCheckerInterface::class);
+        $this->itemProvider = new ItemProvider(
+            $this->sectionProvider,
+            $this->paymentRequestRepository,
+            $this->finalizedPaymentRequestChecker,
+            $this->userContext,
+        );
+    }
+
+    public function testAStateProvider(): void
+    {
+        self::assertInstanceOf(ProviderInterface::class, $this->itemProvider);
+    }
+
+    public function testThrowsAnExceptionIfOperationClassIsNotPaymentRequest(): void
+    {
+        /** @var Operation&MockObject $operation */
+        $operation = $this->createMock(Operation::class);
+        $operation->expects(self::once())->method('getClass')->willReturn(\stdClass::class);
+
+        self::expectException(\InvalidArgumentException::class);
+
+        $this->itemProvider->provide($operation);
+    }
+
+    public function testThrowsAnExceptionIfOperationIsNotPut(): void
+    {
+        /** @var Operation&MockObject $operation */
+        $operation = $this->createMock(Operation::class);
+        $operation->expects(self::once())->method('getClass')->willReturn(PaymentRequestInterface::class);
+
+        self::expectException(\InvalidArgumentException::class);
+
+        $this->itemProvider->provide($operation);
+    }
+
+    public function testThrowsAnExceptionIfSectionIsNotShopApiSection(): void
+    {
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new AdminApiSection());
+
+        self::expectException(\InvalidArgumentException::class);
+
+        $this->itemProvider->provide($this->putOperation(), [], []);
+    }
+
+    public function testReturnsNothingIfPaymentRequestIsNotFound(): void
+    {
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn(null);
+        $this->userContext->expects(self::never())->method('getUser');
+        $this->finalizedPaymentRequestChecker->expects(self::never())->method('isFinal');
+
+        self::assertNull($this->itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+    }
+
+    public function testReturnsNothingIfShopUserHasNoCustomer(): void
+    {
+        /** @var ShopUserInterface&MockObject $user */
+        $user = $this->createMock(ShopUserInterface::class);
+        $user->expects(self::once())->method('getCustomer')->willReturn(null);
+
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->expects(self::once())->method('getUser')->willReturn($user);
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn(
+            $this->createMock(PaymentRequestInterface::class),
+        );
+        $this->finalizedPaymentRequestChecker->expects(self::never())->method('isFinal');
+
+        self::assertNull($this->itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+    }
+
+    public function testReturnsNothingIfPaymentRequestIsNotOwnedByTheCustomer(): void
+    {
+        $customer = $this->stubAuthenticatedCustomer();
+
+        /** @var OrderInterface&MockObject $order */
+        $order = $this->createMock(OrderInterface::class);
+        $order->method('getCustomer')->willReturn($this->createMock(CustomerInterface::class));
+
+        /** @var PaymentInterface&MockObject $payment */
+        $payment = $this->createMock(PaymentInterface::class);
+        $payment->method('getOrder')->willReturn($order);
+
+        /** @var PaymentRequestInterface&MockObject $paymentRequest */
+        $paymentRequest = $this->createMock(PaymentRequestInterface::class);
+        $paymentRequest->method('getPayment')->willReturn($payment);
+
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn($paymentRequest);
+        $this->finalizedPaymentRequestChecker->expects(self::never())->method('isFinal');
+
+        self::assertNull($this->itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+        self::assertNotSame($customer, $order->getCustomer());
+    }
+
+    public function testReturnsNothingIfPaymentRequestIsOwnedByTheCustomerButInFinalState(): void
+    {
+        $paymentRequest = $this->createOwnedPaymentRequest($this->stubAuthenticatedCustomer());
+
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn($paymentRequest);
+        $this->finalizedPaymentRequestChecker->expects(self::once())->method('isFinal')->with($paymentRequest)->willReturn(true);
+
+        self::assertNull($this->itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+    }
+
+    public function testReturnsThePaymentRequestWhenOwnedByTheCustomerAndNotFinal(): void
+    {
+        $paymentRequest = $this->createOwnedPaymentRequest($this->stubAuthenticatedCustomer());
+
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn($paymentRequest);
+        $this->finalizedPaymentRequestChecker->expects(self::once())->method('isFinal')->with($paymentRequest)->willReturn(false);
+
+        self::assertSame($paymentRequest, $this->itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+    }
+
+    public function testWithoutUserContextSkipsOwnershipCheck(): void
+    {
+        $itemProvider = new ItemProvider(
+            $this->sectionProvider,
+            $this->paymentRequestRepository,
+            $this->finalizedPaymentRequestChecker,
+        );
+
+        /** @var PaymentRequestInterface&MockObject $paymentRequest */
+        $paymentRequest = $this->createMock(PaymentRequestInterface::class);
+
+        $this->sectionProvider->expects(self::once())->method('getSection')->willReturn(new ShopApiSection());
+        $this->userContext->expects(self::never())->method('getUser');
+        $this->paymentRequestRepository->expects(self::once())->method('find')->with('hash')->willReturn($paymentRequest);
+        $this->finalizedPaymentRequestChecker->expects(self::once())->method('isFinal')->with($paymentRequest)->willReturn(false);
+
+        self::assertSame($paymentRequest, $itemProvider->provide($this->putOperation(), ['hash' => 'hash'], []));
+    }
+
+    private function putOperation(): Put
+    {
+        return new Put(class: PaymentRequestInterface::class, name: 'put');
+    }
+
+    private function stubAuthenticatedCustomer(): CustomerInterface&MockObject
+    {
+        /** @var CustomerInterface&MockObject $customer */
+        $customer = $this->createMock(CustomerInterface::class);
+
+        /** @var ShopUserInterface&MockObject $user */
+        $user = $this->createMock(ShopUserInterface::class);
+        $user->method('getCustomer')->willReturn($customer);
+
+        $this->userContext->expects(self::once())->method('getUser')->willReturn($user);
+
+        return $customer;
+    }
+
+    private function createOwnedPaymentRequest(CustomerInterface $customer): MockObject&PaymentRequestInterface
+    {
+        /** @var OrderInterface&MockObject $order */
+        $order = $this->createMock(OrderInterface::class);
+        $order->method('getCustomer')->willReturn($customer);
+
+        /** @var PaymentInterface&MockObject $payment */
+        $payment = $this->createMock(PaymentInterface::class);
+        $payment->method('getOrder')->willReturn($order);
+
+        /** @var PaymentRequestInterface&MockObject $paymentRequest */
+        $paymentRequest = $this->createMock(PaymentRequestInterface::class);
+        $paymentRequest->method('getPayment')->willReturn($payment);
+
+        return $paymentRequest;
+    }
+}
diff --git a/tests/Api/Shop/PaymentRequestsTest.php b/tests/Api/Shop/PaymentRequestsTest.php
index c39aaabde9..f1c08ba35c 100644
--- a/tests/Api/Shop/PaymentRequestsTest.php
+++ b/tests/Api/Shop/PaymentRequestsTest.php
@@ -258,6 +258,199 @@ final class PaymentRequestsTest extends JsonApiTestCase
         $this->assertSame(Response::HTTP_NOT_FOUND, $response->getStatusCode());
     }
 
+    /** @test */
+    public function it_does_not_allow_an_anonymous_customer_to_get_a_payment_request_owned_by_a_customer(): void
+    {
+        $paymentRequest = $this->loadPaymentRequestOwnedByOliver();
+
+        $this->client->request(
+            method: 'GET',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->build(),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_does_not_allow_a_customer_to_get_a_payment_request_owned_by_another_customer(): void
+    {
+        $paymentRequest = $this->loadPaymentRequestOwnedByOliver();
+
+        $this->client->request(
+            method: 'GET',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withShopUserAuthorization('dave@doe.com')->build(),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_does_not_allow_an_anonymous_customer_to_update_a_payment_request_owned_by_a_customer(): void
+    {
+        $paymentRequest = $this->loadPaymentRequestOwnedByOliver();
+
+        $this->client->request(
+            method: 'PUT',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withJsonLdContentType()->build(),
+            content: json_encode([
+                'payload' => [
+                    'target_path' => 'https://attacker.tld/target-path',
+                    'after_path' => 'https://attacker.tld/after-path',
+                ],
+            ], \JSON_THROW_ON_ERROR),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_does_not_allow_a_customer_to_update_a_payment_request_owned_by_another_customer(): void
+    {
+        $paymentRequest = $this->loadPaymentRequestOwnedByOliver();
+
+        $this->client->request(
+            method: 'PUT',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withJsonLdContentType()->withShopUserAuthorization('dave@doe.com')->build(),
+            content: json_encode([
+                'payload' => [
+                    'target_path' => 'https://attacker.tld/target-path',
+                    'after_path' => 'https://attacker.tld/after-path',
+                ],
+            ], \JSON_THROW_ON_ERROR),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_does_not_allow_a_shop_user_to_get_a_payment_request_for_a_guest_order(): void
+    {
+        $this->setUpDefaultGetHeaders();
+
+        $fixtures = $this->loadFixturesFromFiles([
+            'authentication/shop_user.yaml',
+            'channel/channel.yaml',
+            'payment_method.yaml',
+            'payment_request/payment_request.yaml',
+            'payment_request/order.yaml',
+        ]);
+
+        /** @var PaymentRequestInterface $paymentRequest */
+        $paymentRequest = $fixtures['payment_request_capture'];
+
+        $this->client->request(
+            method: 'GET',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withShopUserAuthorization('oliver@doe.com')->build(),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_does_not_allow_a_shop_user_to_update_a_payment_request_for_a_guest_order(): void
+    {
+        $fixtures = $this->loadFixturesFromFiles([
+            'authentication/shop_user.yaml',
+            'channel/channel.yaml',
+            'payment_method.yaml',
+            'payment_request/payment_request.yaml',
+            'payment_request/order.yaml',
+        ]);
+
+        /** @var PaymentRequestInterface $paymentRequest */
+        $paymentRequest = $fixtures['payment_request_capture'];
+
+        $this->client->request(
+            method: 'PUT',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withJsonLdContentType()->withShopUserAuthorization('oliver@doe.com')->build(),
+            content: json_encode([
+                'payload' => [
+                    'target_path' => 'https://myshop.tld/target-path',
+                    'after_path' => 'https://myshop.tld/after-path',
+                ],
+            ], \JSON_THROW_ON_ERROR),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_NOT_FOUND);
+    }
+
+    /** @test */
+    public function it_allows_an_anonymous_user_to_get_a_payment_request_for_a_guest_order(): void
+    {
+        $this->setUpDefaultGetHeaders();
+
+        $fixtures = $this->loadFixturesFromFiles([
+            'channel/channel.yaml',
+            'payment_method.yaml',
+            'payment_request/payment_request.yaml',
+            'payment_request/order.yaml',
+        ]);
+
+        /** @var PaymentRequestInterface $paymentRequest */
+        $paymentRequest = $fixtures['payment_request_capture'];
+
+        $this->client->request(
+            method: 'GET',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->build(),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_OK);
+    }
+
+    /** @test */
+    public function it_allows_an_anonymous_user_to_update_a_payment_request_for_a_guest_order(): void
+    {
+        $this->setUpDefaultGetHeaders();
+
+        $fixtures = $this->loadFixturesFromFiles([
+            'channel/channel.yaml',
+            'gateway_config_payment_request.yaml',
+            'payment_method.yaml',
+            'payment_request/payment_request.yaml',
+            'payment_request/order.yaml',
+        ]);
+
+        /** @var PaymentRequestInterface $paymentRequest */
+        $paymentRequest = $fixtures['payment_request_capture'];
+
+        $this->client->request(
+            method: 'PUT',
+            uri: sprintf('/api/v2/shop/payment-requests/%s', $paymentRequest->getHash()),
+            server: $this->headerBuilder()->withJsonLdAccept()->withJsonLdContentType()->build(),
+            content: json_encode([
+                'payload' => [
+                    'target_path' => 'https://myshop.tld/new-target-path',
+                    'after_path' => 'https://myshop.tld/new-after-path',
+                ],
+            ], \JSON_THROW_ON_ERROR),
+        );
+
+        $this->assertResponseCode($this->client->getResponse(), Response::HTTP_OK);
+    }
+
+    private function loadPaymentRequestOwnedByOliver(): PaymentRequestInterface
+    {
+        $fixtures = $this->loadFixturesFromFiles([
+            'authentication/shop_user.yaml',
+            'channel/channel.yaml',
+            'payment_method.yaml',
+            'payment_request/payment_request.yaml',
+            'payment_request/order_with_customer.yaml',
+        ]);
+
+        /** @var PaymentRequestInterface $paymentRequest */
+        $paymentRequest = $fixtures['payment_request_capture'];
+
+        return $paymentRequest;
+    }
+
     public static function createPaymentRequestProvider(): iterable
     {
         yield 'Payment request' => [