Defold Firebase Remote Config documentation

function init(self)
    -- use firebase only if it is supported on the current platform
    if not firebase then
        return
    end

    -- initialise firebase and check that it was successful
    local ok, err = firebase.init()
    if not ok then
        print(err)
        return
    end

    -- initialise remote config and set up a listener to react to
    -- remote config state changes
    firebase.remoteconfig.init(function(self, event)
        -- an error was detected when performing a remote config operation
        if event == firebase.remoteconfig.CONFIG_ERROR then
            return
        end

        -- remote config is initialized and ready for use
        -- setup default values for your remote config
        -- these values will be used until you have loaded updated values from
        -- the server
        if event == firebase.remoteconfig.CONFIG_INITIALIZED then
            firebase.remoteconfig.set_defaults({
                score_bonus = 0,
                score_multiplier = 1,
                holiday_theme = "Christmas",
                holiday_promo_enabled = false,
            })
            return
        end

        -- the defaults have been set and we're now ready to use remote config
        if event == firebase.remoteconfig.CONFIG_DEFAULTS_SET then
            -- you can use get_string(), get_boolean(), get_number() and get_data()
            print("Theme:", firebase.remoteconfig.get_string("holiday_theme"))                  -- Christmas
            print("Promo enabled:", firebase.remoteconfig.get_boolean("holiday_promo_enabled")) -- false
            print("Score multiplier:", firebase.remoteconfig.get_number("score_multiplier"))    -- 1

            -- get and activate new remote config values from the server
            firebase.remoteconfig.fetch_and_activate()
            return
        end

        -- a recently fetched remote config has been activated and is now ready
        -- for use
        if event == firebase.remoteconfig.CONFIG_ACTIVATED then
            print(firebase.remoteconfig.get_string("holiday_theme")) -- Easter
            return
        end
    end)
end