diff --git a/src/main/java/com/adyen/model/binlookup/DSPublicKeyDetail.java b/src/main/java/com/adyen/model/binlookup/DSPublicKeyDetail.java
index 288fdf9a6..d365a0100 100755
--- a/src/main/java/com/adyen/model/binlookup/DSPublicKeyDetail.java
+++ b/src/main/java/com/adyen/model/binlookup/DSPublicKeyDetail.java
@@ -22,7 +22,7 @@
 
 import java.util.Objects;
 
-import com.adyen.serializer.ByteArrayToBase64TypeAdapter;
+import com.adyen.serializer.ByteArrayToStringAdapter;
 import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
 
@@ -39,7 +39,7 @@ public class DSPublicKeyDetail {
     private String directoryServerId = null;
 
     @SerializedName("publicKey")
-    @JsonAdapter(ByteArrayToBase64TypeAdapter.class)
+    @JsonAdapter(ByteArrayToStringAdapter.class)
     private byte[] publicKey = null;
 
     public DSPublicKeyDetail brand(String brand) {
diff --git a/src/main/java/com/adyen/model/checkout/ThreeDSecureData.java b/src/main/java/com/adyen/model/checkout/ThreeDSecureData.java
index a5407ec4f..3214b0266 100644
--- a/src/main/java/com/adyen/model/checkout/ThreeDSecureData.java
+++ b/src/main/java/com/adyen/model/checkout/ThreeDSecureData.java
@@ -23,6 +23,8 @@
 
 import java.io.IOException;
 import java.util.Objects;
+
+import com.adyen.serializer.ByteArrayToStringAdapter;
 import com.google.gson.TypeAdapter;
 import com.google.gson.annotations.JsonAdapter;
 import com.google.gson.annotations.SerializedName;
@@ -37,6 +39,7 @@ public class ThreeDSecureData {
     @SerializedName("authenticationResponse")
     private AuthenticationResponseEnum authenticationResponse = null;
     @SerializedName("cavv")
+    @JsonAdapter(ByteArrayToStringAdapter.class)
     private byte[] cavv = null;
     @SerializedName("cavvAlgorithm")
     private String cavvAlgorithm = null;
@@ -47,6 +50,7 @@ public class ThreeDSecureData {
     @SerializedName("threeDSVersion")
     private String threeDSVersion = null;
     @SerializedName("xid")
+    @JsonAdapter(ByteArrayToStringAdapter.class)
     private byte[] xid = null;
     @SerializedName("dsTransID")
     private String dsTransID = null;
diff --git a/src/main/java/com/adyen/serializer/ByteArrayToBase64TypeAdapter.java b/src/main/java/com/adyen/serializer/ByteArrayToStringAdapter.java
similarity index 84%
rename from src/main/java/com/adyen/serializer/ByteArrayToBase64TypeAdapter.java
rename to src/main/java/com/adyen/serializer/ByteArrayToStringAdapter.java
index 45ab152d8..61f0ed514 100644
--- a/src/main/java/com/adyen/serializer/ByteArrayToBase64TypeAdapter.java
+++ b/src/main/java/com/adyen/serializer/ByteArrayToStringAdapter.java
@@ -28,16 +28,15 @@
 import com.google.gson.JsonPrimitive;
 import com.google.gson.JsonSerializationContext;
 import com.google.gson.JsonSerializer;
-import org.apache.commons.codec.binary.Base64;
 
 import java.lang.reflect.Type;
 
-public class ByteArrayToBase64TypeAdapter implements JsonSerializer<byte[]>, JsonDeserializer<byte[]> {
+public class ByteArrayToStringAdapter implements JsonSerializer<byte[]>, JsonDeserializer<byte[]> {
     public byte[] deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
-        return Base64.decodeBase64(json.getAsString());
+        return json.getAsString().getBytes();
     }
 
     public JsonElement serialize(byte[] src, Type typeOfSrc, JsonSerializationContext context) {
-        return new JsonPrimitive(Base64.encodeBase64String(src));
+        return new JsonPrimitive(new String(src));
     }
 }
\ No newline at end of file
diff --git a/src/test/java/com/adyen/serializer/ByteArrayToStringAdapterTest.java b/src/test/java/com/adyen/serializer/ByteArrayToStringAdapterTest.java
new file mode 100644
index 000000000..471eb5f89
--- /dev/null
+++ b/src/test/java/com/adyen/serializer/ByteArrayToStringAdapterTest.java
@@ -0,0 +1,55 @@
+/*
+ *                       ######
+ *                       ######
+ * ############    ####( ######  #####. ######  ############   ############
+ * #############  #####( ######  #####. ######  #############  #############
+ *        ######  #####( ######  #####. ######  #####  ######  #####  ######
+ * ###### ######  #####( ######  #####. ######  #####  #####   #####  ######
+ * ###### ######  #####( ######  #####. ######  #####          #####  ######
+ * #############  #############  #############  #############  #####  ######
+ *  ############   ############  #############   ############  #####  ######
+ *                                      ######
+ *                               #############
+ *                               ############
+ *
+ * Adyen Java API Library
+ *
+ * Copyright (c) 2019 Adyen B.V.
+ * This file is open source and available under the MIT license.
+ * See the LICENSE file for more info.
+ */
+package com.adyen.serializer;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonPrimitive;
+import org.apache.commons.codec.binary.Base64;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ByteArrayToStringAdapterTest {
+
+    @Test
+    public void testSerialize() {
+        ByteArrayToStringAdapter adapter = new ByteArrayToStringAdapter();
+        byte[] base64Bytes = Base64.encodeBase64("Bytes-To-Be-Encoded".getBytes());
+
+        JsonElement serializedElement = adapter.serialize(base64Bytes, null, null);
+        assertEquals("Qnl0ZXMtVG8tQmUtRW5jb2RlZA==", serializedElement.getAsString());
+    }
+
+    @Test
+    public void testDeserialize() {
+        ByteArrayToStringAdapter adapter = new ByteArrayToStringAdapter();
+        byte[] base64Bytes = Base64.encodeBase64("Bytes-To-Be-Encoded".getBytes());
+
+        JsonElement element = new JsonPrimitive("Qnl0ZXMtVG8tQmUtRW5jb2RlZA==");
+        byte[] deserializedBytes = adapter.deserialize(element, null, null);
+
+        assertArrayEquals(deserializedBytes, base64Bytes);
+    }
+}