Custom payment module form problem

cn flag

I'm a bit new to drupal and i'm trying to create custom payment gateway module and stuck with a problem. When creating OnSitePaymentGateway, everything is ok and i can edit checkout form with PaymentMethodAddForm. But for OffsitePaymentGatewayBase, I'm unable to output additional information to checkout form. This is the code I am using.

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

Then I created CreshioForm.php in src/PluginForm/ and added following code.

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;


I can't see cresh-placeholder in the form.

cn flag
Maybe it's because of the broken markup and the browser is compensating? (You have an extra `</div>`)
cn flag
@Clive Thanks for the comment, yep, that's a mistake, I've removed `</div>`, but that didn't help :(

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