如何将信息传递给 stripe.checkout.sessions.create() 函数

Question

What I want to do: I use firebase so as soon as someone purchases a Product over stripe I want to write that on the document of the user that bought it. I want to use a stripe webhook for that. This webhook looks like this:

It essentially makes a https request to firebase functions as soon as the payment went trough. It triggers a https function that should write to the user's document that he has purchased the product. But to do that the webhook needs to contain the firebase user uid of the user that bought the product.

But to pass the user uid to the webhook I need to pass it to the stripe.checkout.sessions.create() function that looks like this:

    exports.createCheckoutSession = functions.https.onCall(async(data, context) => {
    const YOUR_DOMAIN = 'http://localhost:4242';
    const session = await stripe.checkout.sessions.create({
        payment_method_types: ['card'],
        line_items: [{
            price_data: {
                currency: 'usd',
                product_data: {
                    name: 'Stubborn Attachments',
                    images: ['https://i.imgur.com/EHyR2nP.png'],
                },
                unit_amount: 2000,
            },
            quantity: 1,
        }, ],
        mode: 'payment',
        success_url: `${YOUR_DOMAIN}/success.html`,
        cancel_url: `${YOUR_DOMAIN}/cancel.html`,
    });
    console.log(session.id)
    return session.id
})

(the user calls this cloud function to get a checkout session returned) But how can I pass the user uid ( context.user.uid ) in so I can later send it with the webhook.

I hope it is clear what I want to do if not please ask. Thank you for your time.

Answer 1

You can add Firebase UID of user or any other information in metadata of stripe checkout session like this:

const session = await stripe.checkout.sessions.create({
        payment_method_types: ['card'],
        // line items and other stuff
        metadata: {firebaseUID: uid, product_id: "ProductID"},
    });

You can read them in the checkout session completed webhook or any success webhook.