code: public Observable<Void> validatePurchaseInformationAsync(AppServiceCertificateOrderInner appServiceCertificateOrder) {
          return validatePurchaseInformationWithServiceResponseAsync(appServiceCertificateOrder).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Validate information for a certificate order.
  Validate information for a certificate order.
  
  @param appServiceCertificateOrder Information for a certificate order.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.