diff --git a/src/Gerencianet/Request.php b/src/Gerencianet/Request.php
index 6ba274f..44c7604 100755
--- a/src/Gerencianet/Request.php
+++ b/src/Gerencianet/Request.php
@@ -78,7 +78,9 @@ private function verifyCertificate($certificate)
     public function send($method, $route, $requestOptions)
     {
         try {
-            $requestOptions['cert'] = $this->verifyCertificate($this->config['certificate']);
+            if (isset($this->config['certificate'])) {
+                $requestOptions['cert'] = $this->verifyCertificate($this->config['certificate']);
+            }
 
             if (isset($this->config['headers'])) {
                 foreach ($this->config['headers'] as $key => $value) {