feat: implement payment step

src/Controller/Booking/CreateStep2Controller.php

@@ -166,20 +166,6 @@ class CreateStep2Controller extends AbstractController
         return $response;
     }
 
-    /**
-     * Calculates the total number of participants based on room selections.
-     *
-     * @param BookingCreateDto $bookingCreateDto The booking DTO containing room selections
-     *
-     * @return int Total number of participants required
-     */
-    private function getParticipantsCount(BookingCreateDto $bookingCreateDto): int
-    {
-        return $this
-            ->bookingService
-            ->getParticipantsCount($bookingCreateDto->roomSelections, $bookingCreateDto->travel);
-    }
-
     /**
      * Ensures the booking DTO has the correct number of participant objects.
      *