code: func (s *RegistrarService) TransferDomain(accountID string, domainName string, request *DomainTransferRequest) (*domainTransferResponse, error) {
  	path := versioned(fmt.Sprintf("/%v/registrar/domains/%v/transfers", accountID, domainName))
  	transferResponse := &domainTransferResponse{}
  
  	// TODO: validate mandatory attributes RegistrantID
  
  	resp, err := s.client.post(path, request, transferResponse)
  	if err != nil {
  		return nil, err
  	}
  
  	transferResponse.HttpResponse = resp
  	return transferResponse, nil
  }
docs: // TransferDomain transfers a domain name.
  //
  // See https://developer.dnsimple.com/v2/registrar/#transfer