diff --git a/src/Configuration.php b/src/Configuration.php
index 08ab4e6..7100597 100644
--- a/src/Configuration.php
+++ b/src/Configuration.php
@@ -12,11 +12,6 @@ class Configuration
 
     public function __construct(array $config)
     {
-        foreach (['api_login', 'transaction_key', 'sandbox'] as $required_key) {
-            if (!isset($config[$required_key])) {
-                throw new \InvalidArgumentException("You must provide a value for $required_key");
-            }
-        }
         $this->apiLogin = $config['api_login'];
         $this->transactionKey = $config['transaction_key'];
         $this->sandbox = $config['sandbox'];