code: public static MozuUrl updateExtendedPropertiesUrl(Boolean upsert)
  	{
  		UrlFormatter formatter = new UrlFormatter("/api/commerce/carts/current/extendedproperties?upsert={upsert}");
  		formatter.formatUrl("upsert", upsert);
  		return new MozuUrl(formatter.getResourceUrl(), MozuUrl.UrlLocation.TENANT_POD) ;
  	}
docs: Get Resource Url for UpdateExtendedProperties
  @param upsert Any set of key value pairs to be stored in the extended properties of a cart.
  @return   String Resource Url