/**
  * Saves the billing info to the attendee. @see EE_Attendee::billing_info_for_payment_method() which is used to retrieve it
  * @param EE_Billing_Attendee_Info_Form $billing_form
  * @param EE_Payment_Method $payment_method
  * @return boolean
  */
 public function save_and_clean_billing_info_for_payment_method($billing_form, $payment_method)
 {
     if (!$billing_form instanceof EE_Billing_Attendee_Info_Form) {
         EE_Error::add_error(__('Cannot save billing info because there is none.', 'event_espresso'));
         return false;
     }
     $billing_form->clean_sensitive_data();
     return update_post_meta($this->ID(), $this->get_billing_info_postmeta_name($payment_method), $billing_form->input_values(true));
 }