code: public CertificateBundle getCertificate(String certificateIdentifier) {
          CertificateIdentifier id = new CertificateIdentifier(certificateIdentifier);
          return getCertificate(id.vault(), id.name(), id.version() == null ? "" : id.version());
      }
docs: Gets information about a specified certificate.
  
  @param certificateIdentifier
  The certificate identifier
  @return the CertificateBundle if successful.