Dynamically Return Stripe Order Amount

I'm attempting to retrieve the total order amount on a Stripe charge. It's different for every order. I need this value for Google Ads Dynamic conversions. My Question: How to I retrieve/return the order value after a payment?

//Stripe Payment Backend

app.post('/create-checkout-session', async (req, res) => {
const session = await stripe.checkout.sessions.create({
line_items: [
{
// Provide the exact Price ID (for example, pr_1234) of the product you want to sell
price: 'price_mypriceID',
quantity: 1,
},
],
mode: 'payment',
success_url: `${YOUR_DOMAIN}/dashboard?success=true`,
cancel_url: `${YOUR_DOMAIN}/dashboard?canceled=true`,
});

res.json({url: session.url}) 
});

This code runs on a successful payment, triggering a Google Ads Conversion.

if (location == "?success=true"){

window.gtag('config', 'AW-myaccount');
window.gtag('event', 'conversion', {'send_to': 'AW-myaccount',
'value': {needToReturnDynamicValueHere}, <--------- This 
'currency': 'USD'
});

}, [location])

Nearly a year later I've figured this out:

On the success item below add &session_id={CHECKOUT_SESSION_ID}

app.post('/create-checkout-payWithCourse', async (req, res) => {


    const session = await stripe.checkout.sessions.create({
        line_items: [
            {
                price: 'price_ID',
                quantity: 1,
            },
        ],
        mode: 'payment',
        success_url: `${YOUR_DOMAIN}/?success=true&session_id={CHECKOUT_SESSION_ID}`,
        cancel_url: `${YOUR_DOMAIN}/?canceled=true`,
    });

    res.json({ url: session.url });
});

Then on your backend add a new route as shown below:

app.get('/retrieve-session', async (req, res) => {
    const { session_id } = req.query;

    try {
        const session = await stripe.checkout.sessions.retrieve(session_id);
        res.json(session);
    } catch (error) {
        console.error(error);
        res.status(500).json({ error: 'Failed to retrieve session data from Stripe' });
    }
});

Then on the front end:

if (window.location.href.includes("success=true")) {

    const sessionID = getParameterByName('session_id');

    // Retrieve the session from your server
    const response = await fetch(`/retrieve-session?session_id=${sessionID}`);
    const sessionData = await response.json();


    if (sessionData) {
        console.log(sessionData); // Log the entire sessionData object to inspect its structure
    
        if (sessionData.amount_total) {
            const dynamicAmount = sessionData.amount_total / 100; // Convert amount from cents to dollars
    
            console.log(dynamicAmount);

    }
}