diff --git a/app/Letter/Letter.php b/app/Letter/Letter.php
index 88b6afa0..854913b7 100644
--- a/app/Letter/Letter.php
+++ b/app/Letter/Letter.php
@@ -105,4 +105,18 @@ abstract class Letter extends Document
             }
         }
     }
+
+    /**
+     * @return view-string
+     */
+    public function mailView(): string
+    {
+        $view = 'mail.payment.'.Str::snake(class_basename($this));
+
+        if (!view()->exists($view)) {
+            throw new Exception('Mail view '.$view.' existiert nicht.');
+        }
+
+        return $view;
+    }
 }
diff --git a/app/Payment/PaymentMail.php b/app/Payment/PaymentMail.php
index 45a6fefd..2fad5612 100644
--- a/app/Payment/PaymentMail.php
+++ b/app/Payment/PaymentMail.php
@@ -6,7 +6,6 @@ use App\Letter\Letter;
 use Illuminate\Bus\Queueable;
 use Illuminate\Mail\Mailable;
 use Illuminate\Queue\SerializesModels;
-use Illuminate\Support\Str;
 
 class PaymentMail extends Mailable
 {
@@ -36,9 +35,7 @@ class PaymentMail extends Mailable
      */
     public function build()
     {
-        $template = Str::snake(class_basename($this->letter));
-
-        return $this->markdown('mail.payment.'.$template)
+        return $this->markdown($this->letter->mailView())
                     ->attach($this->filename)
                     ->replyTo('kasse@stamm-silva.de')
                     ->subject($this->letter->getSubject().' | DPSG Stamm Silva');
diff --git a/phpstan.neon b/phpstan.neon
index 1e1ad7f7..0556c7b8 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -10,7 +10,7 @@ parameters:
         - packages/tex/src
 
     # The level 8 is the highest level
-    level: 6
+    level: 7
 
     ignoreErrors:
         -