diff --git a/src/Handlers/HMAC/Validator.php b/src/Handlers/HMAC/Validator.php
index 92560cb..b3efd00 100644
--- a/src/Handlers/HMAC/Validator.php
+++ b/src/Handlers/HMAC/Validator.php
@@ -49,7 +49,7 @@ class Validator extends Hmac
     /**
      * @var string
      */
-    protected string $hash;
+    protected string $hash = '';
 
     /**
      * @param Config $config
@@ -102,4 +102,12 @@ public function validateOrFail(string $header, string $uri, string $method, $dat
 
         throw new BuckarooException($this->config->getLogger(), "HMAC validation failed.");
     }
+
+    /**
+     * @return string
+     */
+    public function getHash(): string
+    {
+        return $this->hash;
+    }
 }
diff --git a/src/Transaction/Response/TransactionResponse.php b/src/Transaction/Response/TransactionResponse.php
index c6b9bbf..0c41959 100644
--- a/src/Transaction/Response/TransactionResponse.php
+++ b/src/Transaction/Response/TransactionResponse.php
@@ -105,9 +105,14 @@ public function isValidationFailure(): bool
      */
     public function data(?string $key = null)
     {
-        if ($key && isset($this->data[$key]))
+        if ($key)
         {
-            return $this->data[$key];
+            if (isset($this->data[$key]))
+            {
+                return $this->data[$key];
+            }
+
+            return null;
         }
 
         return $this->data;