question

const sendMessage = require("./src/sendMessage");
const { SDK } = require("@ringcentral/sdk");
const { Subscriptions } = require("@ringcentral/subscriptions");

const logger = require('pino')(
    {
        messageKey: "message",
        formatters: {
            level: (label) => {
                return { level: label };
            },
        }
    }
);

const sdk = new SDK({
    server: process.env.RC_ENV !== "production" ? SDK.server.sandbox : SDK.server.production,
    clientId: process.env.RC_CLIENT,
    clientSecret: process.env.RC_SECRET
});

const platform = sdk.platform();
const subscriptions = new Subscriptions({
    sdk: sdk,
});

const main = async () => {
    // login
    await platform.login({
        jwt: process.env.RC_JWT,
    });

    // subscribe
    const subscription = subscriptions.createSubscription();
    subscription.on(subscription.events.notification, (evt) => {
        console.log(JSON.stringify(evt, null, 2));
    });
    await subscription.setEventFilters(['/restapi/v1.0/account/~/telephony/sessions']).register();

    // trigger events
    subscription
        .register()
        .then(() => logger.info("Subscribed to events."))
        .catch((err) => {
            logger.error({ err }, err.message)
        });
};

main();