Drupal自定义付款模块表格问题

Question

我对Drupal有点陌生，我正在尝试创建自定义付款网关模块，并遇到问题。 在创建OnSitePaymentGateway时，一切都还好，我可以使用Paymethodaddform编辑结帐表格。但是对于OffSitePaymentGateWayBase，我无法输出其他信息以结帐表格。 此处的代码详细信息：

/**
 * Provides the Cresh payment gateway.
 *
 * @CommercePaymentGateway(
 *   id = "creshio",
 *   label = "Cresh.io",
 *   display_label = "Cresh.io",
 *    forms = {
 *     "offsite-payment" = "Drupal\commerce_creshio\PluginForm\CreshioForm",
 *   },
 *
 *   js_library = "commerce_creshio/creshlib",
 * )
 */
class Creshio extends OffsitePaymentGatewayBase { .... }

然后，我在src/ pluginform/中创建了creshioform.php，并添加了以下内容：

class CreshioForm extends BasePaymentOffsiteForm {
     public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
         $form = parent::buildConfigurationForm($form, $form_state);
         $form['#wrapper_id'] = Html::getUniqueId('payment-add-form-wrapper');
         $form['#prefix'] = '<div id="cresh-placeholder">';
         $form['#suffix'] = '</div>';
         return $form;
     }
}

我看不到cresh-placeholder的形式