code: func (api *API) CheckLogpushDestinationExists(zoneID, destinationConf string) (bool, error) {
  	uri := "/zones/" + zoneID + "/logpush/validate/destination/exists"
  	res, err := api.makeRequest("POST", uri, LogpushDestinationExistsRequest{
  		DestinationConf: destinationConf,
  	})
  	if err != nil {
  		return false, errors.Wrap(err, errMakeRequestError)
  	}
  	var r LogpushDestinationExistsResponse
  	err = json.Unmarshal(res, &r)
  	if err != nil {
  		return false, errors.Wrap(err, errUnmarshalError)
  	}
  	return r.Result.Exists, nil
  }
docs: // CheckLogpushDestinationExists returns destination exists check result.
  //
  // API reference: https://api.cloudflare.com/#logpush-jobs-check-destination-exists