code: public void add(CertificateAddParameter certificate, CertificateAddOptions certificateAddOptions) {
          addWithServiceResponseAsync(certificate, certificateAddOptions).toBlocking().single().body();
      }
docs: Adds a certificate to the specified account.
  
  @param certificate The certificate to be added.
  @param certificateAddOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws BatchErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent