diff --git a/src/Resources/AbstractUnzerResource.php b/src/Resources/AbstractUnzerResource.php
index 59a3750d..b1abfb7e 100644
--- a/src/Resources/AbstractUnzerResource.php
+++ b/src/Resources/AbstractUnzerResource.php
@@ -501,6 +501,10 @@ private function exposeProperties(): array
 
         $properties = [];
         foreach ($reflectionProperties as $propertyObject) {
+            if ($propertyObject->isStatic()) {
+                continue;
+            }
+
             $property = $propertyObject->getName();
             $value = $propertyObject->getValue($this);
 
diff --git a/src/Resources/V2/Paypage.php b/src/Resources/V2/Paypage.php
index d7a7b4fa..8ae7571f 100644
--- a/src/Resources/V2/Paypage.php
+++ b/src/Resources/V2/Paypage.php
@@ -22,7 +22,7 @@ class Paypage extends AbstractUnzerResource
 {
     public const URI = '/merchant/paypage';
 
-    protected static $keyClassMap = [
+    private static $keyClassMap = [
         'urls' => Urls::class,
         'style' => Style::class,
         'resources' => Resources::class,
diff --git a/test/integration/Resources/BasketV2Test.php b/test/integration/Resources/BasketV2Test.php
index ec9a666d..3469675e 100644
--- a/test/integration/Resources/BasketV2Test.php
+++ b/test/integration/Resources/BasketV2Test.php
@@ -212,7 +212,7 @@ public function authorizeTransactionsShouldPassAlongTheBasketIdIfSet(): void
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $authorize = $paypal->authorize(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $authorize = $paypal->authorize(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
 
         $fetchedPayment = $this->unzer->fetchPayment($authorize->getPaymentId());
         $this->assertEquals($basket->expose(), $fetchedPayment->getBasket()->expose());
@@ -261,7 +261,7 @@ public function authorizeTransactionsShouldCreateBasketIfItDoesNotExistYet(): vo
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $authorize = $paypal->authorize(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $authorize = $paypal->authorize(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
         $this->assertNotEmpty($basket->getId());
 
         $fetchedPayment = $this->unzer->fetchPayment($authorize->getPaymentId());
@@ -290,7 +290,7 @@ public function chargeTransactionsShouldCreateBasketIfItDoesNotExistYet(): void
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $charge = $paypal->charge(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $charge = $paypal->charge(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
         $this->assertNotEmpty($basket->getId());
 
         $fetchedPayment = $this->unzer->fetchPayment($charge->getPaymentId());
diff --git a/test/integration/Resources/BasketV3Test.php b/test/integration/Resources/BasketV3Test.php
index 55f60d99..07ddefd9 100644
--- a/test/integration/Resources/BasketV3Test.php
+++ b/test/integration/Resources/BasketV3Test.php
@@ -220,7 +220,7 @@ public function authorizeTransactionsShouldPassAlongTheBasketIdIfSet(): void
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $authorize = $paypal->authorize(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $authorize = $paypal->authorize(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
 
         $fetchedPayment = $this->unzer->fetchPayment($authorize->getPaymentId());
         $this->assertEquals($basket->expose(), $fetchedPayment->getBasket()->expose());
@@ -248,7 +248,7 @@ public function authorizeTransactionsShouldCreateBasketIfItDoesNotExistYet(): vo
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $authorize = $paypal->authorize(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $authorize = $paypal->authorize(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
         $this->assertNotEmpty($basket->getId());
 
         $fetchedPayment = $this->unzer->fetchPayment($authorize->getPaymentId());
@@ -277,7 +277,7 @@ public function chargeTransactionsShouldCreateBasketIfItDoesNotExistYet(): void
 
         /** @var Paypal $paypal */
         $paypal = $this->unzer->createPaymentType(new Paypal());
-        $charge = $paypal->charge(123.4, 'EUR', 'https://unzer.com', null, null, null, $basket);
+        $charge = $paypal->charge(99.99, 'EUR', 'https://unzer.com', null, null, null, $basket);
         $this->assertNotEmpty($basket->getId());
 
         $fetchedPayment = $this->unzer->fetchPayment($charge->getPaymentId());
diff --git a/test/integration/Resources/PaypageV2Test.php b/test/integration/Resources/PaypageV2Test.php
index 73c4fd0e..f2d8f25e 100644
--- a/test/integration/Resources/PaypageV2Test.php
+++ b/test/integration/Resources/PaypageV2Test.php
@@ -76,7 +76,8 @@ public function createMinimumPaypageTest()
 
         $this->assertNull($paypage->getUrls());
         $this->assertNull($paypage->getStyle());
-        $this->assertNull($paypage->getResources());
+        $this->assertNull($paypage->getResources()->getCustomerId());
+        $this->assertNull($paypage->getResources()->getBasketId());
         $this->assertNull($paypage->getPaymentMethodsConfigs());
         $this->assertNull($paypage->getRisk());
     }
@@ -271,6 +272,7 @@ public function assertCreatedPaypage(Paypage $paypage): void
     {
         $this->assertNotNull($paypage->getId());
         $this->assertNotNull($paypage->getRedirectUrl());
+        $this->assertNotNull($paypage->getResources()->getMetadataId());
         $this->assertStringContainsString($paypage->getId(), $paypage->getRedirectUrl());
     }