diff --git a/src/NotchPay.php b/src/NotchPay.php
index 6deeb7c..d462b6e 100644
--- a/src/NotchPay.php
+++ b/src/NotchPay.php
@@ -6,13 +6,13 @@
 
 class NotchPay
 {
-    /** @var string The Paystack API key to be used for requests. */
+    /** @var string The Notch Pay API key to be used for requests. */
     public static string $apiKey;
 
     /** @var string The instance API key, settable once per new instance */
     private $instanceApiKey;
 
-    /** @var string The base URL for the Paystack API. */
+    /** @var string The base URL for the Notch Pay API. */
     public static $apiBase = 'https://api.notchpay.co';
 
     /**
@@ -39,7 +39,7 @@ private static function validateApiKey($apiKey): bool
             throw new InvalidArgumentException('Api key must be a string and cannot be empty');
         }
 
-        if(substr( $apiKey, 0, 2 ) !== "b." && substr( $apiKey, 0, 3 ) !== "sb." ) {
+        if(substr( $apiKey, 0, 2 ) !== "b." && substr( $apiKey, 0, 3 ) !== "sb."  && substr( $apiKey, 0, 2 ) !== "pk.") {
             throw new InvalidArgumentException('Api key must have a valid signature.');
         }
         return true;
diff --git a/src/Util/Util.php b/src/Util/Util.php
index c3a5316..4059349 100644
--- a/src/Util/Util.php
+++ b/src/Util/Util.php
@@ -28,7 +28,7 @@ public static function utf8(mixed $value): mixed
     }
 
     /**
-     * Converts a response from the Paystack API to the corresponding PHP object.
+     * Converts a response from the Notch Pay API to the corresponding PHP object.
      */
     public static function convertArrayToObject(array $resp): array|object
     {