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Я использовал платежный шлюз Stripe для добавления опции оплаты в свой проект, в моей модели пользовательской схемы я добавил isPaid (который по умолчанию является логическим значением var и false), при успешном платеже я хочу сделать isPaid = true, ниже приведен мой index.js и checkout.js , но при попытке реализовать req.user.isPaid = true; я либо не могу получить доступ к этой переменной, либо она становится true перед оплатой.С нетерпением жду некоторой помощи

 // // GET checkout
    
router.get('/checkout', middleware.isLoggedIn, (req, res) => {
    if (req.user.isPaid) {
        req.flash('success', 'Your account is already paid');
        return res.redirect('/students');
    }
    // payWithCard(stripe, card, data.clientSecret);
    res.render('checkout', { amount: 100 });
});

const calculateOrderAmount = items => {
  
  return 100;
};
router.post("/create-payment-intent", async (req, res) => {
  const { items } = req.body;
  // Create a PaymentIntent with the order amount and currency
  try{
    const paymentIntent = await stripe.paymentIntents.create({
    amount: calculateOrderAmount(items),
    currency: "inr"
  });

  res.send({
    clientSecret: paymentIntent.client_secret
  });
    }
    catch(e){

    }
});
  

Это мой checkout.js

//checkout.js

     var stripe = Stripe(process.env.SecretKey);
    
    // The items the customer wants to buy
    var purchase = {
        items: [{ id: "Teacher Registration Fee" }],
        currency: "inr"
        };
    
    // Disable the button until we have Stripe set up on the page
    document.querySelector("button").disabled = true;
    fetch("/create-payment-intent", {
      method: "POST",
      headers: {
        "Content-Type": "application/json"
      },
      body: JSON.stringify(purchase)
    })
      .then(function(result) {
        return result.json();
      })
      .then(function(data) {
        var elements = stripe.elements();
        var style = {
          base: {
            color: "#32325d",
            fontFamily: 'Arial, sans-serif',
            fontSmoothing: "antialiased",
            fontSize: "16px",
            "::placeholder": {
              color: "#32325d"
            }
          },
          invalid: {
            fontFamily: 'Arial, sans-serif',
            color: "#fa755a",
            iconColor: "#fa755a"
          }
        };
        var card = elements.create("card", { style: style });
        // Stripe injects an iframe into the DOM
        card.mount("#card-element");
        card.on("change", function (event) {
          // Disable the Pay button if there are no card details in the Element
          document.querySelector("button").disabled = event.empty;
          document.querySelector("#card-error").textContent = event.error ? event.error.message : "";
        });
        var form = document.getElementById("payment-form");
        form.addEventListener("submit", function(event) {
          event.preventDefault();
          // Complete payment when the submit button is clicked
          payWithCard(stripe, card, data.clientSecret);
        });
      });
    // Calls stripe.confirmCardPayment
    // If the card requires authentication Stripe shows a pop-up modal to
    // prompt the user to enter authentication details without leaving your page.
    var payWithCard = function(stripe, card, clientSecret) {
      loading(true);
      stripe
        .confirmCardPayment(clientSecret, {
          payment_method: {
            card: card
          }
        })
        .then(function(result) {
          if (result.error) {
            // Show error to your customer
            showError(result.error.message);
          } else {
            // The payment succeeded!
            orderComplete(result.paymentIntent.id);
          }
        });
    };
    /* ------- UI helpers ------- */
    // Shows a success message when the payment is complete
    var orderComplete = function(paymentIntentId) {
      loading(false);
      document
        .querySelector(".result-message a")
        .setAttribute(
          "href",
          "https://dashboard.stripe.com/test/payments/"   paymentIntentId
        );
      document.querySelector(".result-message").classList.remove("hidden");
      document.querySelector("button").disabled = true;
    };
    // Show the customer the error from Stripe if their card fails to charge
    var showError = function(errorMsgText) {
      loading(false);
      var errorMsg = document.querySelector("#card-error");
      errorMsg.textContent = errorMsgText;
      setTimeout(function() {
        errorMsg.textContent = "";
      }, 4000);
    };
    // Show a spinner on payment submission
    var loading = function(isLoading) {
      if (isLoading) {
        // Disable the button and show a spinner
        document.querySelector("button").disabled = true;
        document.querySelector("#spinner").classList.remove("hidden");
        document.querySelector("#button-text").classList.add("hidden");
      } else {
        document.querySelector("button").disabled = false;
        document.querySelector("#spinner").classList.add("hidden");
        document.querySelector("#button-text").classList.remove("hidden");
      }
    };