public function getGeneratePreviews(array $fields = array(), array $params = array(), $pending = false)
 {
     $this->assureId();
     $param_types = array('ad_format' => 'ad_format_enum', 'creative' => 'AdCreative', 'dynamic_creative_spec' => 'Object', 'height' => 'unsigned int', 'interactive' => 'bool', 'locale' => 'string', 'post' => 'Object', 'product_item_ids' => 'list<string>', 'width' => 'unsigned int');
     $enums = array('ad_format_enum' => AdPreviewAdFormatValues::getInstance()->getValues());
     $request = new ApiRequest($this->api, $this->data['id'], RequestInterface::METHOD_GET, '/generatepreviews', new AdPreview(), 'EDGE', AdPreview::getFieldsEnum()->getValues(), new TypeChecker($param_types, $enums));
     $request->addParams($params);
     $request->addFields($fields);
     return $pending ? $request : $request->execute();
 }
 protected static function getReferencedEnums()
 {
     $ref_enums = array();
     $ref_enums['AdFormat'] = AdPreviewAdFormatValues::getInstance()->getValues();
     return $ref_enums;
 }