diff --git a/app/Helpers/helpers.php b/app/Helpers/helpers.php
index 0515fa6..2a00986 100644
--- a/app/Helpers/helpers.php
+++ b/app/Helpers/helpers.php
@@ -142,6 +142,10 @@ function storeAuthEvent(string $name, Request $request): void
 
 /**
  * Store resource events
+ *
+ * @param  string  $name  Event name
+ * @param  array<int, mixed>  $data  Event data
+ * @param  Request  $request
  */
 function storeResourceEvent(string $name, array $data, Request $request): void
 {
@@ -205,7 +209,7 @@ function localeAppUrl(): string
 /**
  * Original quality :D
  */
-function convertToOriginalFormat($apiPrice)
+function convertToOriginalFormat(int|float|string $apiPrice): string
 {
     $originalPrice = intval($apiPrice) / 100;
 
@@ -214,8 +218,11 @@ function convertToOriginalFormat($apiPrice)
 
 /**
  * Date day mf
+ *
+ * @param  string  $month
+ * @param  string  $year
  */
-function lastDayOfMonth($month, $year)
+function lastDayOfMonth(string $month, int|string $year): DateTime
 {
     $date = new DateTime("$year-$month-01");
     $date->modify('last day of this month');
@@ -225,8 +232,12 @@ function lastDayOfMonth($month, $year)
 
 /**
  * Get index by value from array
+ *
+ * @param  mixed  $value  Value to be searched
+ * @param  array<int, mixed>  $array  Array
+ * @return null|int
  */
-function indexByValue($value, $array)
+function indexByValue(mixed $value, array $array): ?int
 {
     for ($i = 0; $i < count($array); $i++) {
         if ($array[$i] == $value) {
diff --git a/app/Http/Controllers/AlertController.php b/app/Http/Controllers/AlertController.php
index 159d9f3..9c75d42 100644
--- a/app/Http/Controllers/AlertController.php
+++ b/app/Http/Controllers/AlertController.php
@@ -2,15 +2,24 @@
 
 namespace App\Http\Controllers;
 
+use App\Models\Alert;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Http\JsonResponse;
+
 class AlertController extends Controller
 {
     /**
      * Get alerts for user
      */
-    public function index()
+    public function index(): JsonResponse
     {
-        $alerstQuery = auth()->user()->alerts()->whereNull('seen_at');
+        /** @var \App\Models\User */
+        $user = auth()->user();
 
+        /** @var \Illuminate\Database\Eloquent\Builder<Alert> */
+        $alerstQuery = $user->alerts()->whereNull('seen_at');
+
+        /** @var Collection<array-key, Alert> */
         $alerts = $alerstQuery->get();
 
         $alerstQuery->update([
@@ -22,10 +31,13 @@ class AlertController extends Controller
 
     /**
      * Format
+     *
+     * @param  Collection<array-key, Alert>  $alerts
+     * @return Collection<array-key, Alert>
      */
-    public function format($alerts)
+    public function format(Collection $alerts): Collection
     {
-        return $alerts->map(fn ($alert) => [
+        return $alerts->map(fn (Alert $alert) => [
             'name' => $alert->name,
             'value' => $alert->value,
         ]);
diff --git a/app/Repos/Payment/OnlinePaymentRepo.php b/app/Repos/Payment/OnlinePaymentRepo.php
index 440d9e4..06a4b60 100644
--- a/app/Repos/Payment/OnlinePaymentRepo.php
+++ b/app/Repos/Payment/OnlinePaymentRepo.php
@@ -192,7 +192,7 @@ class OnlinePaymentRepo
             'title' => __('Payment is successful'),
             'pnr' => $paymentHistory->orderNumber,
             'branch_name' => $bank_branch->name,
-            'price_amount' => convertToOriginalFormat($paymentHistory->amount).' TMT',
+            'price_amount' => \convertToOriginalFormat($paymentHistory->amount).' TMT',
             'return_url' => $returnURL,
         ];
     }
diff --git a/phpstan.neon b/phpstan.neon
index 74e0b5d..6b6fe97 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -7,7 +7,7 @@ parameters:
         - app/
 
     # Level 9 is the highest level
-    level: 5
+    level: 6
 
 #    ignoreErrors:
 #        - '#PHPDoc tag @var#'