const theropay = require('theropay')('sk_test...');
const paymentIntent = await theropay.paymentIntents.create({
  amount: 2000,
  currency: 'usd',
  payment_method_types: ['card', 'crypto']
});
app.post('/create-payment', async (req, res) => {
  try {
    const { items, currency } = req.body;
    const amount = calculateAmount(items);
    const paymentIntent = await theropay.paymentIntents.create({
      amount,
      currency,
      automatic_payment_methods: { enabled: true }
    });
    res.send({ clientSecret: paymentIntent.client_secret });
  } catch (error) {
    res.status(400).send({ error: error.message });
  }
});