diff --git a/src/Transports/OAuth2.php b/src/Transports/OAuth2.php
index 2de4408..99957c6 100644
--- a/src/Transports/OAuth2.php
+++ b/src/Transports/OAuth2.php
@@ -73,6 +73,11 @@ public function setOptions(array $options): OAuth2
     public function rawRequest($endpoint, array $data = [], $method = 'get')
     {
         $this->getClient()->setHeader('Authorization', 'Bearer '.$this->getToken());
+
+        foreach($this->provider->getHeaders() as $name => $value) {
+            $this->getClient()->setHeader($name, $value);
+        }
+
         return parent::rawRequest($endpoint, $data, $method);
     }