var (
	defaultHelpPostfix = func(key string) string {
		return config.DefaultHelpPostfix(DefaultKVS, key)
	}

	// Help holds configuration keys and their default values for api subsystem.
	Help = config.HelpKVS{
		config.HelpKV{
			Key:         apiRequestsMax,
			Description: `set the maximum number of concurrent requests (default: auto)`,
			Optional:    true,
			Type:        "number",
		},
		config.HelpKV{

// the STS TLS API.
var DefaultKVS = config.KVS{
	config.KV{
		Key:   skipVerify,
		Value: "off",
	},
}

// Help is the help and description for the STS API K/V configuration.
var Help = config.HelpKVS{
	config.HelpKV{
		Key:         skipVerify,
		Description: `trust client certificates without verification (default: 'off')`,
		Optional:    true,
		Type:        "on|off",
	},

		config.KV{
			Key:   RoleID,
			Value: "",
		},
	}

	defaultHelpPostfix = func(key string) string {
		return config.DefaultHelpPostfix(DefaultKVS, key)
	}

	// Help for Identity Plugin
	Help = config.HelpKVS{
		config.HelpKV{
			Key:         URL,
			Description: `plugin hook endpoint (HTTP(S)) e.g. "http://localhost:8181/path/to/endpoint"` + defaultHelpPostfix(URL),
			Type:        "url",
		},
		config.HelpKV{

// help for each sub-system key.
var HelpSubSysMap = map[string]HelpKVS{}

// RegisterHelpSubSys - this function saves
// input help KVS for each sub-system globally,
// this function should be called only once
// preferably in during `init()`.
func RegisterHelpSubSys(helpKVSMap map[string]HelpKVS) {
	maps.Copy(HelpSubSysMap, helpKVSMap)
}