diff --git a/src/Analytics/Adapter.php b/src/Analytics/Adapter.php
index 048bbcd..564bded 100644
--- a/src/Analytics/Adapter.php
+++ b/src/Analytics/Adapter.php
@@ -45,7 +45,7 @@ abstract public function getName(): string;
     /**
      * Global Headers
      *
-     * @var array
+     * @var array<mixed>
      */
     protected $headers = [
         'Content-Type' => '',
@@ -133,7 +133,7 @@ public function createEvent(Event $event): bool
      * @return array|string
      * @throws \Exception
      */
-    public function call(string $method, string $path = '', array $headers = array(), array $params = array()): array|string
+    public function call(string $method, string $path = '', array $headers = array(), array $params = array()): array<mixed>|string
     {
         $headers            = array_merge($this->headers, $headers);
         $ch                 = curl_init((str_contains($path, 'http') ? $path : $this->endpoint . $path . (($method == 'GET' && !empty($params)) ? '?' . http_build_query($params) : '')));
@@ -217,7 +217,7 @@ public function call(string $method, string $path = '', array $headers = array()
      *
      * @param array $data
      * @param string $prefix
-     * @return array
+     * @return array<mixed>
      */
     protected function flatten(array $data, string $prefix = ''): array {
         $output = [];
@@ -249,4 +249,4 @@ protected function logError(Exception $e) {
         Console::error('[Error] File: ' . $e->getFile());
         Console::error('[Error] Line: ' . $e->getLine());
     }
-}
\ No newline at end of file
+}