fix: correctly determine number of participants

src/Service/BookingSummaryDataService.php

@@ -75,9 +75,12 @@ class BookingSummaryDataService
         // Fetch CMS data (images, etc.)
         $cmsData = $this->getCmsData($bookingDto);
 
+        // Calculate participant count from room capacity (source of truth)
+        $participantCount = $this->calculateParticipantCountFromRooms($bookingDto);
+
         return [
             'selectedRooms' => $selectedRooms,
-            'participantCount' => count($bookingDto->participants),
+            'participantCount' => $participantCount,
             'totalPrice' => number_format($totalPrice, 2, ',', '.').' €',
             'groupedSelectedRooms' => $groupedSelectedRooms,
             'assignmentCounts' => $roomCounts,
@@ -86,6 +89,27 @@ class BookingSummaryDataService
         ];
     }
 
+    /**
+     * Calculates participant count from room selections.
+     *
+     * This is the source of truth for participant count, calculated by
+     * multiplying each selected room's quantity by its maximum capacity (maxPax).
+     */
+    private function calculateParticipantCountFromRooms(BookingDto $bookingDto): int
+    {
+        $totalCapacity = 0;
+        $availableRooms = $bookingDto->travel->getAvailableRooms();
+
+        foreach ($bookingDto->roomSelections as $selection) {
+            if ($selection->quantity > 0 && isset($availableRooms[$selection->roomId])) {
+                $room = $availableRooms[$selection->roomId];
+                $totalCapacity += $selection->quantity * ($room->maxPax ?? 0);
+            }
+        }
+
+        return $totalCapacity;
+    }
+
     /**
      * Fetches CMS data for the product and hotel in the booking.
      *