diff --git a/src/OneLoginClient.php b/src/OneLoginClient.php
index 992e7a2..2f7d321 100644
--- a/src/OneLoginClient.php
+++ b/src/OneLoginClient.php
@@ -45,7 +45,12 @@ class OneLoginClient
     /** @var GuzzleHttp\Client client  */
     protected $client;
 
-    /** @var string $clientID OneLogin Client ID */
+    /** @var string $clientId OneLogin Client ID */
+    public $clientId;
+
+    /** @var string $clientID OneLogin Client ID
+     *  @deprecated Use $clientId instead
+     */
     public $clientID;
 
     /** @var string $clientSecret OneLogin Client  */
@@ -88,6 +93,7 @@ public function __construct($clientId, $clientSecret, $region = "us", $maxResult
     {
         $this->client = new Client();
         $this->clientId = $clientId;
+        $this->clientID =& $this->clientId;
         $this->clientSecret = $clientSecret;
         $this->urlBuilder = new UrlBuilder($region);
         $this->userAgent = OneLoginClient::CUSTOM_USER_AGENT;
diff --git a/src/exceptions/OneLoginException.php b/src/exceptions/OneLoginException.php
index 13b9a0b..d0f564d 100644
--- a/src/exceptions/OneLoginException.php
+++ b/src/exceptions/OneLoginException.php
@@ -13,7 +13,7 @@ class OneLoginException extends \Exception
     /** @var string $errorAttribute The attribute that caused the error if available */
     protected $errorAttribute;
 
-    public function __construct($message = "", $code = 0, $errorAttribute = null, \Throwable $previous = null)
+    public function __construct($message = "", $code = 0, $errorAttribute = null, ?\Throwable $previous = null)
     {
         parent::__construct($message, $code, $previous);
         $this->errorCode = $code;