diff --git a/src/Resources/Keypair.php b/src/Resources/Keypair.php
index 6308e6ea..ef8db4d9 100755
--- a/src/Resources/Keypair.php
+++ b/src/Resources/Keypair.php
@@ -2,8 +2,8 @@
 
 namespace UnzerSDK\Resources;
 
-use UnzerSDK\Adapter\HttpAdapterInterface;
 use stdClass;
+use UnzerSDK\Adapter\HttpAdapterInterface;
 
 /**
  * This represents the key pair resource.
@@ -14,7 +14,7 @@
 class Keypair extends AbstractUnzerResource
 {
     /** @var string $publicKey */
-    private $publicKey;
+    protected $publicKey;
 
     /** @var string $privateKey */
     private $privateKey;
@@ -23,19 +23,19 @@ class Keypair extends AbstractUnzerResource
     private $detailed = false;
 
     /** @var array $paymentTypes */
-    private $paymentTypes = [];
+    protected $paymentTypes = [];
 
     /** @var string $secureLevel */
-    private $secureLevel;
+    protected $secureLevel;
 
     /** @var string $alias */
-    private $alias;
+    protected $alias;
 
     /** @var string $merchantName */
-    private $merchantName;
+    protected $merchantName;
 
     /** @var string $merchantAddress */
-    private $merchantAddress;
+    protected $merchantAddress;
 
     /**
      * Credentials on File / Card on File
@@ -43,10 +43,10 @@ class Keypair extends AbstractUnzerResource
      *
      * @var bool|null $cof
      */
-    private $cof;
+    protected $cof;
 
     /** @var bool $validateBasket */
-    private $validateBasket;
+    protected $validateBasket;
 
     /**
      * @return string|null
diff --git a/test/integration/Resources/KeypairTest.php b/test/integration/Resources/KeypairTest.php
index 523ac22c..d3c40c84 100644
--- a/test/integration/Resources/KeypairTest.php
+++ b/test/integration/Resources/KeypairTest.php
@@ -12,6 +12,7 @@
 namespace UnzerSDK\test\integration\Resources;
 
 use RuntimeException;
+use UnzerSDK\Resources\Keypair;
 use UnzerSDK\test\BaseIntegrationTest;
 use UnzerSDK\Unzer;
 
@@ -52,14 +53,30 @@ public function invalidKeysShouldResultInException($key): void
      *
      * @test
      */
-    public function keypairShouldReturnExpectedValues(): void
+    public function keypairShouldReturnExpectedValues(): Keypair
     {
         $keypair = $this->unzer->fetchKeypair();
         $this->assertNotNull($keypair);
         $this->assertNotEmpty($keypair->getPublicKey());
-        $this->assertNotEmpty($keypair->getPrivateKey());
         $this->assertNotEmpty($keypair->getAvailablePaymentTypes());
         $this->assertNotEmpty($keypair->getSecureLevel());
+        return $keypair;
+    }
+
+    /**
+     * Verify keypair can be fetched using the public key extracted from a previous fetch.
+     *
+     * @test
+     *
+     * @depends keypairShouldReturnExpectedValues
+     */
+    public function keypairCanBeFetchedUsingPublicKey(Keypair $keypair): void
+    {
+        $publicKey = $keypair->getPublicKey();
+        $fetchedKeypair = (new Unzer($publicKey))->fetchKeypair();
+        $this->assertNotNull($fetchedKeypair);
+        $this->assertEquals($publicKey, $fetchedKeypair->getPublicKey());
+        $this->assertNotEmpty($fetchedKeypair->getSecureLevel());
     }
 
     /**
@@ -76,4 +93,27 @@ public function keypairShouldBeFetchableWithDetails(): void
         $this->assertNotEmpty($keypair->getPaymentTypes());
         $this->assertNotEmpty($keypair->getSecureLevel());
     }
+
+    /**
+     * Verify expose() reflects the fetched keypair's properties and excludes privateKey and detailed.
+     *
+     * @test
+     */
+    public function exposeReflectsKeypairPropertiesAfterFetch(): void
+    {
+        $keypair = $this->unzer->fetchKeypair(true);
+        $exposed = $keypair->expose();
+
+        // Main scalar properties must match keypair getters
+        $this->assertEquals($keypair->getPublicKey(), $exposed['publicKey']);
+        $this->assertEquals($keypair->getSecureLevel(), $exposed['secureLevel']);
+
+        // Nested payment type objects must be present and match
+        $this->assertNotEmpty($exposed['paymentTypes']);
+        $this->assertEquals($keypair->getPaymentTypes(), $exposed['paymentTypes']);
+
+        // privateKey (private) and detailed (private) must never be exposed
+        $this->assertArrayNotHasKey('privateKey', $exposed);
+        $this->assertArrayNotHasKey('detailed', $exposed);
+    }
 }
diff --git a/test/unit/Resources/KeypairTest.php b/test/unit/Resources/KeypairTest.php
index 0abba060..a7b696cf 100755
--- a/test/unit/Resources/KeypairTest.php
+++ b/test/unit/Resources/KeypairTest.php
@@ -135,4 +135,42 @@ public function aKeypairShouldBeUpdatedWithDetailsThroughResponseHandling(): voi
         $this->assertEquals('Unzer GmbH', $keypair->getMerchantName());
         $this->assertEquals('Vangerowstraße 18, 69115 Heidelberg', $keypair->getMerchantAddress());
     }
+
+    /**
+     * Verify expose() contains all relevant key data but excludes privateKey and detailed.
+     *
+     * @test
+     */
+    public function exposeContainsAllRelevantKeyDataExceptPrivateKeyAndDetailed(): void
+    {
+        $keypair = new Keypair();
+        $paymentTypes = [(object)['type' => 'card'], (object)['type' => 'paypal']];
+        $keypair->handleResponse((object)[
+            'publicKey'       => 's-pub-1234',
+            'privateKey'      => 's-priv-4321',
+            'paymentTypes'    => $paymentTypes,
+            'secureLevel'     => 'SAQ-D',
+            'alias'           => 'Readme.io user',
+            'merchantName'    => 'Unzer GmbH',
+            'merchantAddress' => 'Vangerowstraße 18, 69115 Heidelberg',
+            'cof'             => true,
+            'validateBasket'  => false,
+        ]);
+
+        $exposed = $keypair->expose();
+
+        // All relevant protected key data should be exposed with correct values
+        $this->assertEquals('s-pub-1234', $exposed['publicKey']);
+        $this->assertEquals($paymentTypes, $exposed['paymentTypes']);
+        $this->assertEquals('SAQ-D', $exposed['secureLevel']);
+        $this->assertEquals('Readme.io user', $exposed['alias']);
+        $this->assertEquals('Unzer GmbH', $exposed['merchantName']);
+        $this->assertEquals('Vangerowstraße 18, 69115 Heidelberg', $exposed['merchantAddress']);
+        $this->assertTrue($exposed['cof']);
+        $this->assertFalse($exposed['validateBasket']);
+
+        // privateKey (private) and detailed (private) must never be exposed
+        $this->assertArrayNotHasKey('privateKey', $exposed);
+        $this->assertArrayNotHasKey('detailed', $exposed);
+    }
 }