diff --git a/src/Api/ApiClient.php b/src/Api/ApiClient.php
index d89d879..b6f5fc3 100644
--- a/src/Api/ApiClient.php
+++ b/src/Api/ApiClient.php
@@ -69,7 +69,9 @@ public function __construct() {
    *   The response from the API.
    */
   public function sendRequest(
-    string $method, string $endpoint, array $data = []
+    string $method,
+    string $endpoint,
+    array $data = []
   ): mixed {
     $timestamp = gmdate('c');
     $authKey = $this->generateAuthKey($timestamp);
diff --git a/src/Service/StatusCheckService.php b/src/Service/StatusCheckService.php
index 21655ad..ace93d5 100644
--- a/src/Service/StatusCheckService.php
+++ b/src/Service/StatusCheckService.php
@@ -4,18 +4,39 @@
 
 use QuickTopUpAPI\Api\ApiClient;
 
-class StatusCheckService
-{
-    private $apiClient;
+/**
+ * Class StatusCheckService
+ *
+ * @package QuickTopUpAPI\Service
+ *
+ * A simple service to check the status of a transaction.
+ */
+class StatusCheckService {
+  private ApiClient $apiClient;
 
-    public function __construct(ApiClient $apiClient)
-    {
-        $this->apiClient = $apiClient;
-    }
+  /**
+   * StatusCheckService constructor.
+   *
+   * @param  ApiClient  $apiClient
+   *   The API client.
+   */
+  public function __construct(ApiClient $apiClient) {
+    $this->apiClient = $apiClient;
+  }
+
+  /**
+   * Check the status of a transaction.
+   *
+   * @param  string  $ctid
+   *   The CTID.
+   *
+   * @return array
+   *   The transaction status.
+   */
+  public function checkStatus($ctid) {
+    $endpoint = 'WSGetTransactionStatus';
+
+    return $this->apiClient->sendRequest('POST', $endpoint, ['CTID' => $ctid]);
+  }
 
-    public function checkStatus($ctid)
-    {
-        $endpoint = 'WSGetTransactionStatus';
-        return $this->apiClient->sendRequest('POST', $endpoint, ['CTID' => $ctid]);
-    }
 }