Stripe API refund after subscription cancelled

Question

From the Stripe docs:

When you cancel the subscription, the customer\'s card will not be charged again, but no money will be refunded either. If you

Answer 1

After researching for a while, I came to this flow written in JavaScript for Node.js:

refundAndUnsubscribe = async function () {
    try {

        // Set proration date to this moment:
        const proration_date = Math.floor(Date.now() / 1000);

        let sub = await stripe.subscriptions.retrieve("sub_CILnalN9HpvADj");

        // See what the next invoice would look like with a plan switch
        // and proration set:
        let items = [{
            quantity: 0,
            id: sub.items.data[0].id,
            plan: "your_plan" // Switch to new plan
        }];


        let invoices = await stripe.invoices.retrieveUpcoming('cus_CIP9dtlq143gq7', 'sub_CILnalN9HpvADj', {
            subscription_items: items,
            subscription_proration_date: proration_date
        });

        //List all invoices
        let payedInvoicesList = await stripe.invoices.list({
            customer: 'cus_CIP9dtlq143gq7'
        });

        // Calculate the proration cost:
        let current_prorations = [];
        let cost = 0;
        for (var i = 0; i < invoices.lines.data.length; i++) {
            let invoice_item = invoices.lines.data[i];
            if (invoice_item.period.start == proration_date) {
                current_prorations.push(invoice_item);
                cost += invoice_item.amount;
            }
        }

        //create a refund
        if (cost !== 0) {
            cost = (cost < 0) ? cost * -1 : cost //A positive integer in cents

            let refund = await stripe.refunds.create({
                charge: payedInvoicesList.data[0].charge,
                amount: cost
            });
        }

        // delete subscription
        return stripe.subscriptions.del('sub_CILnalN9HpvADj');

    } catch (e) {
        console.log(e);
    }
}