diff --git a/src/main/java/com/mercadopago/client/MercadoPagoClient.java b/src/main/java/com/mercadopago/client/MercadoPagoClient.java
index d9487acd..396f24ed 100644
--- a/src/main/java/com/mercadopago/client/MercadoPagoClient.java
+++ b/src/main/java/com/mercadopago/client/MercadoPagoClient.java
@@ -51,18 +51,7 @@ public MercadoPagoClient(MPHttpClient httpClient) {
    * @throws MPException exception
    */
   protected MPResponse send(MPRequest request) throws MPException, MPApiException {
-    String uri = UrlFormatter.format(request.getUri(), request.getQueryParams());
-
-    return httpClient.send(
-        MPRequest.builder()
-            .uri(uri)
-            .method(request.getMethod())
-            .headers(addDefaultHeaders(request))
-            .payload(request.getPayload())
-            .connectionRequestTimeout(addConnectionRequestTimeout(request, null))
-            .connectionTimeout(addConnectionTimeout(request, null))
-            .socketTimeout(addSocketTimeout(request, null))
-            .build());
+    return this.send(request, null);
   }
 
   /**
@@ -75,13 +64,21 @@ protected MPResponse send(MPRequest request) throws MPException, MPApiException
    */
   protected MPResponse send(MPRequest request, MPRequestOptions requestOptions)
       throws MPException, MPApiException {
-    return this.send(
-        this.buildRequest(
-            request.getUri(),
-            request.getMethod(),
-            request.getPayload(),
-            request.getQueryParams(),
-            requestOptions));
+    String uri = UrlFormatter.format(request.getUri(), request.getQueryParams());
+    Map<String, String> defaultHeader = addDefaultHeaders(request);
+    Map<String, String> addHeader = addCustomHeaders(defaultHeader, uri, requestOptions);
+
+    return httpClient.send(
+        MPRequest.builder()
+            .uri(uri)
+            .accessToken(getAccessToken(requestOptions))
+            .method(request.getMethod())
+            .headers(addHeader)
+            .payload(request.getPayload())
+            .connectionRequestTimeout(addConnectionRequestTimeout(request, requestOptions))
+            .connectionTimeout(addConnectionTimeout(request, requestOptions))
+            .socketTimeout(addSocketTimeout(request, requestOptions))
+            .build());
   }
 
   /**
@@ -204,7 +201,7 @@ private MPRequest buildRequest(
         .payload(payload)
         .method(method)
         .queryParams(queryParams)
-        .headers(addCustomHeaders(path, requestOptions))
+        .headers(addCustomHeaders(defaultHeaders, path, requestOptions))
         .connectionRequestTimeout(addConnectionRequestTimeout(null, requestOptions))
         .connectionTimeout(addConnectionTimeout(null, requestOptions))
         .socketTimeout(addSocketTimeout(null, requestOptions))
@@ -247,9 +244,7 @@ private int addConnectionRequestTimeout(MPRequest request, MPRequestOptions requ
     return MercadoPagoConfig.getConnectionRequestTimeout();
   }
 
-  private Map<String, String> addCustomHeaders(String uri, MPRequestOptions requestOptions) {
-    Map<String, String> headers = new HashMap<>();
-
+  private Map<String, String> addCustomHeaders(Map<String, String> headers, String uri, MPRequestOptions requestOptions) {
     if (Objects.nonNull(requestOptions) && Objects.nonNull(requestOptions.getCustomHeaders())) {
       for (Map.Entry<String, String> entry : requestOptions.getCustomHeaders().entrySet()) {
         headers.put(entry.getKey().toLowerCase(), entry.getValue());
diff --git a/src/test/java/com/mercadopago/client/preference/PreferenceClientIT.java b/src/test/java/com/mercadopago/client/preference/PreferenceClientIT.java
index 47136559..a60b6129 100644
--- a/src/test/java/com/mercadopago/client/preference/PreferenceClientIT.java
+++ b/src/test/java/com/mercadopago/client/preference/PreferenceClientIT.java
@@ -11,15 +11,20 @@
 import com.mercadopago.client.common.AddressRequest;
 import com.mercadopago.client.common.IdentificationRequest;
 import com.mercadopago.client.common.PhoneRequest;
+import com.mercadopago.core.MPRequestOptions;
 import com.mercadopago.exceptions.MPApiException;
 import com.mercadopago.exceptions.MPException;
+import com.mercadopago.net.Headers;
 import com.mercadopago.net.MPElementsResourcesPage;
 import com.mercadopago.net.MPSearchRequest;
 import com.mercadopago.resources.preference.Preference;
 import com.mercadopago.resources.preference.PreferenceSearch;
 import java.math.BigDecimal;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.UUID;
 import org.junit.jupiter.api.Test;
 
 /** PreferenceClientIT class. */
@@ -82,11 +87,25 @@ void createSuccess() {
   void createWithRequestOptionsSuccess() {
     try {
       PreferenceRequest preferenceRequest = buildPreferenceRequest();
-      Preference preference = client.create(preferenceRequest, buildRequestOptions());
+
+      String idempotency = UUID.randomUUID().toString();
+      Map<String, String> idempotencyKey = new HashMap<>();
+      idempotencyKey.put(Headers.IDEMPOTENCY_KEY, idempotency);
+      MPRequestOptions mpRequestOptions = MPRequestOptions
+          .builder()
+          .customHeaders(idempotencyKey)
+          .build();
+
+
+      Preference preference = client.create(preferenceRequest, mpRequestOptions);
 
       assertNotNull(preference.getResponse());
       assertEquals(CREATED, preference.getResponse().getStatusCode());
       assertNotNull(preference.getId());
+      System.out.println(idempotency);
+      System.out.println(idempotencyKey);
+      System.out.println(mpRequestOptions);
+      System.out.println("preference: " + preference.getResponse().getHeaders());
     } catch (MPApiException mpApiException) {
       fail(mpApiException.getApiResponse().getContent());
     } catch (MPException mpException) {