diff --git a/src/Client.php b/src/Client.php
index b46dd0c..b9df1bf 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -30,6 +30,8 @@ class Client {
 
   protected $validator = null;
 
+  protected $authHeaders = null;
+
   public function setValidatorFactory(Factory $validator) {
     $this->validator = $validator;
   }
@@ -117,16 +119,17 @@ public function request($method, $path, $data = null) {
       $clientOptions['handler'] = $this->handler;
     }
 
+    $headers = array_merge([
+      'Accept' => 'application/json',
+      'Content-Type' => 'application/json',
+      'User-Agent' => $this->getUserAgent(),
+    ], $this->getAuthHeaders());
+
     $guzzleClient = new GuzzleClient($clientOptions);
 
     try {
       $guzzleResponse = $guzzleClient->request($method, $uri, [
-        'headers' => [
-          'Authorization' => 'Bearer '.$this->getApiKey(),
-          'Accept' => 'application/json',
-          'Content-Type' => 'application/json',
-          'User-Agent' => $this->getUserAgent(),
-        ],
+        'headers' => $headers,
         'timeout' => 10,
         'body' => $data,
         'on_stats' => [$this, 'recordStats']
@@ -138,6 +141,18 @@ public function request($method, $path, $data = null) {
     }
   }
 
+  public function getAuthHeaders() {
+    if (is_array($this->authHeaders)) {
+      return $this->authHeaders;
+    }
+
+    return ['Authorization' => 'Bearer '.$this->getApiKey()];
+  }
+
+  public function setAuthHeaders(array $headers) {
+    $this->authHeaders = $headers;
+  }
+
   public function getUserAgent(): string {
     return 'crud-sugar-sdk/1.0.0';
   }
diff --git a/tests/Unit/ClientTest.php b/tests/Unit/ClientTest.php
index 1274f4d..11548c5 100644
--- a/tests/Unit/ClientTest.php
+++ b/tests/Unit/ClientTest.php
@@ -173,4 +173,30 @@ public function testUserAgent() {
     // Then
     $this->assertIsString($userAgent);
   }
+
+  public function testGetDefaultAuthHeaders() {
+    // Given
+    $apiKey = uniqid();
+    $this->getClient()->setApiKey($apiKey);
+
+    // When
+    $authHeaders = $this->getClient()->getAuthHeaders();
+
+    // Then
+    $this->assertEquals(['Authorization' => 'Bearer '.$apiKey], $authHeaders);
+  }
+
+  public function testSetAuthHeaders() {
+    // Given
+    $authHeaderKey = uniqid();
+    $apiKey = uniqid();
+    $this->getClient()->setApiKey($apiKey);
+    $this->getClient()->setAuthHeaders([$authHeaderKey => $apiKey]);
+
+    // When
+    $authHeaders = $this->getClient()->getAuthHeaders();
+
+    // Then
+    $this->assertEquals([$authHeaderKey => $apiKey], $authHeaders);
+  }
 }