Débloquez un tutoriel vidéo après le paiement avec le nodejs Stripe ex: (les tutorials de udemy)

I created a registration page for the user to have their own account and a login page for them to log in. Now, after the user is logged in, I submit a video tutorial payable with Stripe. What I wanted was after purchasing this course with Stripe. The tutorial automatically unlocks for the user.

here is my code with Stripe. I tested it and it works great.

const postCharge = (req, res) =>{
    console.log(req.body);

   const email = req.body.stripeEmail
   const source = req.body.stripeToken

   const savePayment = new Payment({
       email: email,
       source: source
   })

   /***  */
    savePayment.save((err, userPayment) =>{
        if(err) console.log(err);
    })
   /*** */
   
  
    stripe.customers.create({
      email: email,
      source:  source
    })
    .then(customer => stripe.charges.create({
        amount: 2500,
        currency: "usd",
        customer: customer.id
    }))
    
    .then(() => res.render('success'))
    .catch((error) => console.log(error))
    
    
}

I want to save somewhere that user now has access to the tutorial (eg in MongoDB if you are using it)

s soon as he clicks he goes directly to the tutorial now unlocked thanks to the payment

<button class=“btn btn-info my-2 my-sm-0 m-3”> <a class=“nav-link text-white " href=”/Tuto"> Access aux Cours </a> </button>

But his link doesn’t work if he pays