code: def create(cls, csr, duration, package, altnames=None, dcv_method=None):
          
          params = {'csr': csr, 'package': package, 'duration': duration}
          if altnames:
              params['altnames'] = altnames
          if dcv_method:
              params['dcv_method'] = dcv_method
  
          try:
              result = cls.call('cert.create', params)
          except UsageError:
              params['--dry-run'] = True
              msg = '\n'.join(['%s (%s)' % (err['reason'], err['attr'])
                               for err in cls.call('cert.create', params)])
              cls.error(msg)
              raise
  
          if dcv_method in ('dns', 'file'):
              cls.advice_dcv_method(csr, package, altnames, dcv_method,
                                    cert_id=result['params'].get('cert_id'))
          return result
docs: Create a new certificate.