How can I get COOKIE_SESSION_SECRET?

Hello, I’m contacting you to solve my problem.

I’m just following https://github.com/hgezim/express-shopify-auth to authenticate my app.

But I can’t replace the ‘COOKIE_SESSION_SECRET’ in the code.

Someone please tell me how can I get my cookie session secret key and replace the word.

I represent the code on the github page below:

const verifyRequest = new VerifyAuthMiddleware()

  // sets up secure session data on each request

app.use(cookieSession({ secure: true, sameSite: 'none', secret: **COOKIE_SESSION_SECRET** }))

       // bind instance of ShopifyAuthMiddleware

       .use(shopifyAuth.use.bind(shopifyAuth))

       // bind instance of VerifyAuthMiddleware

       .use(verifyRequest.use.bind(verifyRequest))

       // application code

       .use((req, res, next) => {

              res.send('?')

       })
;

app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))