code: func (api *API) DeleteFirewallRules(zoneID string, firewallRuleIDs []string) error {
  	ids := strings.Join(firewallRuleIDs, ",")
  	uri := fmt.Sprintf("/zones/%s/firewall/rules?id=%s", zoneID, ids)
  
  	_, err := api.makeRequest("DELETE", uri, nil)
  	if err != nil {
  		return errors.Wrap(err, errMakeRequestError)
  	}
  
  	return nil
  }
docs: // DeleteFirewallRules updates a single firewall rule.
  //
  // API reference: https://developers.cloudflare.com/firewall/api/cf-firewall-rules/delete/#delete-multiple-rules