I am using the pre-built stripe checkout session in node.js. here's my function:

app.get('/create-checkout-session', async (req, res) => {
    let customer = {
        price: req.query.price,
        quantity: req.query.quantity,
        page: req.query.page,
        email: req.query.email,
        name: req.query.name
    }

    // insertIntoDbPreCheckout(customer, req, res)

    let successurl = 'http://localhost:1111/' + customer.page + ''
    let failedurl = 'http://localhost:1111/' + customer.page + ''
  const session = await stripe.checkout.sessions.create({
    payment_method_types: ['card'],
    metadata: {
      'description': customer.page
    },
    customer_email: customer.email,
    line_items: [
      {
        price_data: {
          currency: 'cad',
          product_data: {
            name: customer.page,
          },
          unit_amount: customer.price,
        },
        quantity: customer.quantity,
      },
    ],
    mode: 'payment',
    success_url: successurl,
    cancel_url: failedurl,
  })

  res.redirect(303, session.url);
});

i am trying to pass METADATA through, but it isn't letting me.

I cannot find anything online that shows me how to do this, and it is not working no matter what I try. How can i fix this?

edit:

when i log the customers, it shows like this:

     email: 'uuu@u.com',
  invoice_prefix: '9FC11B6D',
  invoice_settings: { custom_fields: null, default_payment_method: null, footer: null },
  livemode: false,
  metadata: {},

as you can see, metadata is empty