code: func (api *API) ListVirtualDNS() ([]*VirtualDNS, error) {
  	res, err := api.makeRequest("GET", "/user/virtual_dns", nil)
  	if err != nil {
  		return nil, errors.Wrap(err, errMakeRequestError)
  	}
  
  	response := &VirtualDNSListResponse{}
  	err = json.Unmarshal(res, &response)
  	if err != nil {
  		return nil, errors.Wrap(err, errUnmarshalError)
  	}
  
  	return response.Result, nil
  }
docs: // ListVirtualDNS lists the virtual DNS clusters associated with an account.
  //
  // API reference: https://api.cloudflare.com/#virtual-dns-users--get-virtual-dns-clusters