Allow Guest Seats & Price Per Guest in Webform Booking

Suggested Code Updates for "Allow Guest Seats & Price Per Guest" Feature

File: webform_booking/src/Form/WebformBookingSettingsForm.php
Purpose: Add an option in the admin UI to enable guest seats and set a price per guest.

$form['allow_guest_seats'] = [
  '#type' => 'checkbox',
  '#title' => $this->t('Allow guests'),
  '#description' => $this->t('Enable this to allow users to bring guests.'),
  '#default_value' => $config->get('allow_guest_seats'),
];

$form['max_guest_seats'] = [
  '#type' => 'number',
  '#title' => $this->t('Maximum Guests per Booking'),
  '#description' => $this->t('Set the maximum number of guests a user can bring.'),
  '#default_value' => $config->get('max_guest_seats'),
  '#min' => 0,
  '#step' => 1,
];

$form['price_per_guest'] = [
  '#type' => 'textfield',
  '#title' => $this->t('Price per Guest'),
  '#description' => $this->t('Set a separate price for guests.'),
  '#default_value' => $config->get('price_per_guest'),
  '#size' => 10,
  '#maxlength' => 10,
  '#states' => [
    'visible' => [
      ':input[name="allow_guest_seats"]' => ['checked' => TRUE],
    ],
  ],
];

File: webform_booking/src/Plugin/WebformElement/BookingSeats.php
Purpose: Modify the booking seat selection form to include guest selection.

if ($config->get('allow_guest_seats')) {
  $element['guest_seats'] = [
    '#type' => 'number',
    '#title' => $this->t('Number of Guests'),
    '#description' => $this->t('Select the number of guests (max @max)', ['@max' => $config->get('max_guest_seats')]),
    '#min' => 0,
    '#max' => $config->get('max_guest_seats'),
    '#step' => 1,
  ];
}

File: webform_booking/src/Service/AvailabilityService.php
Purpose: Modify the availability logic to reduce slot capacity based on both booked seats and guests.

$seats_booked = $submission->getElementData('seats');
$guest_seats = $submission->getElementData('guest_seats') ?? 0;
$total_seats_used = $seats_booked + $guest_seats;

// Ensure availability calculation includes guests.
$available_seats = $this->getAvailableSeats($webform_id, $slot_time);
if ($total_seats_used > $available_seats) {
  throw new WebformSubmissionException($this->t('Not enough seats available for this slot.'));
}

File: webform_booking/src/Payment/PaymentService.php
Purpose: Ensure guest pricing is added to the total payment.

$seats_booked = $submission->getElementData('seats');
$guest_seats = $submission->getElementData('guest_seats') ?? 0;
$seat_price = $this->getPricePerSeat($webform_id);
$guest_price = $this->getPricePerGuest($webform_id);

$total_price = ($seats_booked * $seat_price) + ($guest_seats * $guest_price);

Summary of Changes

• Adds an admin setting to enable/disable guest seats.
• Allows users to select guests while booking.
• Ensures guests reduce availability (no overbooking).
• Supports different pricing for seats vs guests.
• Modifies PayPal/Stripe payment logic to charge guests separately.

Would the module maintainer consider adding this feature?

I’m happy to test this functionality, provide additional code, or even help submit a patch if needed.

Thanks for your time, and let me know what you think.