code: func authzMetaToPB(authz core.Authorization) (*vapb.AuthzMeta, error) {
  	return &vapb.AuthzMeta{
  		Id:    &authz.ID,
  		RegID: &authz.RegistrationID,
  	}, nil
  }
docs: // This file defines functions to translate between the protobuf types and the
  // code types.