code: func (api *API) TransferRegistrarDomain(accountID, domainName string) ([]RegistrarDomain, error) {
  	uri := fmt.Sprintf("/accounts/%s/registrar/domains/%s/transfer", accountID, domainName)
  
  	res, err := api.makeRequest("POST", uri, nil)
  	if err != nil {
  		return []RegistrarDomain{}, errors.Wrap(err, errMakeRequestError)
  	}
  
  	var r RegistrarDomainsDetailResponse
  	err = json.Unmarshal(res, &r)
  	if err != nil {
  		return []RegistrarDomain{}, errors.Wrap(err, errUnmarshalError)
  	}
  	return r.Result, nil
  }
docs: // TransferRegistrarDomain initiates the transfer from another registrar
  // to Cloudflare Registrar.
  //
  // API reference: https://api.cloudflare.com/#registrar-domains-transfer-domain