webform_pagamentos.module

<?php

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\webform\WebformInterface;
use Drupal\webform\WebformSubmissionInterface;

use Symfony\Component\HttpFoundation\RedirectResponse;

function webform_pagamentos_webform_third_party_settings_form_alter(array &$form, FormStateInterface $form_state) {
    $webform = $form_state->getFormObject()->getEntity();

    $form['third_party_settings']['webform_pagamentos'] = [
        '#type' => 'details',
        '#title' => t('Universidade de São Paulo - Pagamentos'),
        '#open' => FALSE,
    ];

    $form['third_party_settings']['webform_pagamentos']['habilitar_boleto'] = [
        '#type' => 'checkbox',
        '#title' => t('Habilitar Boleto'),
        '#default_value' => $webform->getThirdPartySetting('webform_pagamentos', 'habilitar_boleto', FALSE),
    ];

    $form['third_party_settings']['webform_pagamentos']['habilitar_pix'] = [
        '#type' => 'checkbox',
        '#title' => t('Habilitar Pix'),
        '#default_value' => $webform->getThirdPartySetting('webform_pagamentos', 'habilitar_pix', FALSE),
    ];

}