diff --git a/Provider.php b/Provider.php
index 9be52d3..ccb01f9 100644
--- a/Provider.php
+++ b/Provider.php
@@ -105,17 +105,17 @@ protected function parseAccessToken($body)
      */
     protected function getUserByToken($token)
     {
-        if (is_null($this->steamId)) {
+        if (is_null($token)) {
             return null;
         }
 
-        if (empty($this->getConfig('api_key'))) {
+        if (empty($this->getConfig('client_secret'))) {
             throw new RuntimeException('The Steam API key has not been specified.');
         }
 
         $response = $this->getHttpClient()->request(
             'GET',
-            sprintf(self::STEAM_INFO_URL, $this->getConfig('api_key'), $this->steamId)
+            sprintf(self::STEAM_INFO_URL, $this->getConfig('client_secret'), $token)
         );
 
         $contents = json_decode($response->getBody()->getContents(), true);
@@ -298,6 +298,6 @@ protected function getTokenUrl()
 
     public static function additionalConfigKeys()
     {
-        return ['api_key', 'realm', 'https', 'proxy'];
+        return ['client_secret', 'realm', 'https', 'proxy'];
     }
 }
diff --git a/README.md b/README.md
index d6df9a3..a790d4b 100644
--- a/README.md
+++ b/README.md
@@ -11,10 +11,10 @@ Please see the [Base Installation Guide](https://socialiteproviders.com/usage/),
 ### Add configuration to `config/services.php`
 
 ```php
-'steam' => [    
-  'client_id' => env('STEAM_CLIENT_ID'),  
-  'client_secret' => env('STEAM_CLIENT_SECRET'),  
-  'redirect' => env('STEAM_REDIRECT_URI') 
+'steam' => [
+  'client_id' => null,
+  'client_secret' => env('STEAM_CLIENT_SECRET'),
+  'redirect' => env('STEAM_REDIRECT_URI')
 ],
 ```