stripe.js

    const STRIPE_KEY="sk_test_STRIPE_KEY";
    const configureStripe = require('stripe');
    const stripe = configureStripe(STRIPE_KEY);

    stripe.charges.create(req.body, function (err, res) {
        if (err) {
            context.res = { status: 400, body: err};
        } else {
           context.res = { status: 200, body: res };
        }
        context.done();
    });