If you don't have a backend server yet, create one. You can use Node.js, Express, or any other backend framework you like.

Use the Stripe package to set up endpoints for handling Stripe interactions.

Here's an example with Node.js and Express:
```javascript
const express = require('express');
const stripe = require('stripe')('your-secret-key-here');
const app = express();

app.use(express.json());

// Endpoint for creating a payment intent
app.post('/create-payment-intent', async (req, res) => {
const { amount } = req.body;
try {
const paymentIntent = await stripe.paymentIntents.create({
amount: amount,
currency: 'usd',
});
res.status(200).send({ clientSecret: paymentIntent.client_secret });
} catch (error) {
res.status(400).send({ error: error.message });
}
});

app.listen(3000, () => {
console.log('Server is running on port 3000');
});
```