/**
* Método que genera el formulario de pago en HTML
*
* @param string $button_type
* Dimensión del boton a mostrar
*
* @return string
* Formulario renderizado
*/
public function renderForm($button_type = '100x50')
{
$values = $this->getFormLabels();
$html = new DOMDocument();
$html->formatOutput = true;
$form = $html->createElement('form');
$form->setAttribute('action', $this->getApiUrl());
$form->setAttribute('method', 'POST');
foreach ($values as $name => $value) {
$input_hidden = $html->createElement('input');
$input_hidden->setAttribute('type', 'hidden');
$input_hidden->setAttribute('name', $name);
$input_hidden->setAttribute('value', $value);
$form->appendChild($input_hidden);
}
$input_hidden = $html->createElement('input');
$input_hidden->setAttribute('type', 'hidden');
$input_hidden->setAttribute('name', 'agent');
$input_hidden->setAttribute('value', $this->agent);
$form->appendChild($input_hidden);
$buttons = Khipu::getButtonsKhipu();
if (isset($buttons[$button_type])) {
$button = $buttons[$button_type];
} else {
$button = $buttons['100x50'];
}
$submit = $html->createElement('input');
$submit->setAttribute('type', 'image');
$submit->setAttribute('src', $button);
$form->appendChild($submit);
$html->appendChild($form);
return $html->saveHTML();
}