# Headless SDK

### Customize the payment experience using Headless functions

#### 1. Initialize the Hyperswitch SDK

Initialize Juspay Hyperswitch Headless SDK onto your app with your publishable key. To get a Publishable Key please find it [here](https://app.hyperswitch.io/developers).

<pre class="language-javascript"><code class="lang-javascript"><strong>// Source Hyperloader on your HTML file using the &#x3C;script /> tag
</strong>hyper = Hyper.init("YOUR_PUBLISHABLE_KEY",{
    customBackendUrl: "YOUR_BACKEND_URL",
    //You can configure this as an endpoint for all the api calls such as session, payments, confirm call.
});
</code></pre>

#### 2. Create a PaymentIntent

Make a request to the endpoint on your server to create a new Payment. The `clientSecret` returned by your endpoint is used to initialize the payment session.

{% hint style="danger" %}
**Important**: Make sure to never share your API key with your client application as this could potentially compromise your security
{% endhint %}

#### 3. Initialize your Payment Session

Initialize a Payment Session by passing the clientSecret to the `initPaymentSession`

```javascript
paymentSession = hyper.initPaymentSession({
  clientSecret: client_secret,
});
```

| options (Required)                   | Description                                                     |
| ------------------------------------ | --------------------------------------------------------------- |
| `paymentIntentClientSecret (string)` | **Required.** Required to use as the identifier of the payment. |

#### 4. Craft a customized payments experience

Using the `paymentSession` object, the default customer payment method data can be fetched, using which you can craft your own payments experience. The `paymentSession` object also exposes a `confirmWithCustomerDefaultPaymentMethod` and `confirmWithLastUsedPaymentMethod` function, using which you can confirm and handle the payment session.

**4a. Confirm using Customer Default Payment Method:**

```javascript
paymentMethodSession = await paymentSession.getCustomerSavedPaymentMethods();

if (paymentMethodSession.error) {
    // handle the case where no default customer payment method is not present
} else {
    // use the customer_default_saved_payment_method_data to fulfill your usecases (render UI)
    const customer_default_saved_payment_method_data =
        paymentMethodSession.getCustomerDefaultSavedPaymentMethodData();
}

// handle submit for pay button 
function handleSubmit() { 
    if (paymentMethodSession.error) {
        // handle the case where no default customer payment method is not present
    } else {
        // use the confirmWithCustomerDefaultPaymentMethod function to confirm and handle the payment session response
        const { error, status } = await
        paymentMethodSession.
            confirmWithCustomerDefaultPaymentMethod({
                confirmParams: {
                    // Make sure to change this to your payment completion page
                    return_url: "https://example.com/complete"
                },
                // if you wish to redirect always, otherwise it is defaulted to "if_required"
                redirect: "always",
                // Pass the CardCVCElement id
                id: "card-cvc-element"
            });

        // use error, status to complete the payment journey
        if (error) {
            if (error.message) {
                // handle error messages
                setMessage(error.message);
            } else {
                setMessage("An unexpected error occurred.");
            }
        }
        if (status) {
            // handle payment status
            handlePaymentStatus(status);
        }
    }
}
```

**Payload for** `confirmWithCustomerDefaultPaymentMethod(payload)`

<table><thead><tr><th width="296">options (Required)</th><th>Description</th></tr></thead><tbody><tr><td><code>confirmParams (object)</code></td><td>Parameters that will be passed on to the Hyper API.</td></tr><tr><td><code>redirect (string)</code></td><td><p><strong>Can be either 'always' or 'if_required'</strong></p><p>By default, <code>confirmWithCustomerDefaultPaymentMethod()</code> will always redirect to your <code>return_url</code> after a successful confirmation. If you set redirect: "if_required", then this method will only redirect if your user chooses a redirection-based payment method.</p></td></tr><tr><td><code>id (string)</code><strong><code>(optional)</code></strong></td><td>The id used when creating the CardCVCElement.</td></tr></tbody></table>

**ConfirmParams object**

<table><thead><tr><th width="281">confirmParams</th><th>Description</th></tr></thead><tbody><tr><td><code>return_url(string)</code></td><td>The url your customer will be directed to after they complete payment.</td></tr></tbody></table>

**4b. Confirm using Last Used Payment Method:**

```javascript
paymentMethodSession = await paymentSession.getCustomerSavedPaymentMethods();

if (paymentMethodSession.error) {
    // handle the case where no default customer payment method is not present
} else {
    // use the customer_last_used_payment_method_data to fulfill your usecases (render UI)
    const customer_last_used_payment_method_data =
        paymentMethodSession.getCustomerLastUsedPaymentMethodData();
}

// handle submit for pay button 
function handleSubmit() { 
    if (paymentMethodSession.error) {
        // handle the case where no default customer payment method is not present
    } else {
        // use the confirmWithLastUsedPaymentMethod function to confirm and handle the payment session response
        const { error, status } = await
        paymentMethodSession.
            confirmWithLastUsedPaymentMethod({
                confirmParams: {
                    // Make sure to change this to your payment completion page
                    return_url: "https://example.com/complete"
                },
                // if you wish to redirect always, otherwise it is defaulted to "if_required"
                redirect: "always",
                // Pass the CardCVCElement id
                id: "card-cvc-element"
            });

        // use error, status to complete the payment journey
        if (error) {
            if (error.message) {
                // handle error messages
                setMessage(error.message);
            } else {
                setMessage("An unexpected error occurred.");
            }
        }
        if (status) {
            // handle payment status
            handlePaymentStatus(status);
        }
    }
}
```

**Payload for** `confirmWithLastUsedPaymentMethod(payload)`

<table><thead><tr><th width="296">options (Required)</th><th>Description</th></tr></thead><tbody><tr><td><code>confirmParams (object)</code></td><td>Parameters that will be passed on to the Hyper API.</td></tr><tr><td><code>redirect (string)</code></td><td><p><strong>Can be either 'always' or 'if_required'</strong></p><p>By default, <code>confirmWithLastUsedPaymentMethod()</code> will always redirect to your <code>return_url</code> after a successful confirmation. If you set redirect: "if_required", then this method will only redirect if your user chooses a redirection-based payment method.</p></td></tr><tr><td><code>id (string)</code><strong><code>(optional)</code></strong></td><td>The id used when creating the CardCVCElement.</td></tr></tbody></table>

**ConfirmParams object**

<table><thead><tr><th width="281">confirmParams</th><th>Description</th></tr></thead><tbody><tr><td><code>return_url(string)</code></td><td>The url your customer will be directed to after they complete payment.</td></tr></tbody></table>

#### 5. Add CVC Collection (Non PCI Approach)

The `CardCVCElement` renders a secure iframe to collect the customer's CVC without exposing sensitive data to your application. You can follow the [React Integration](https://docs.hyperswitch.io/explore-hyperswitch/payment-experience/payment/web/react-with-rest-api-integration).

```javascript
import React, { useState, useEffect } from "react";
import {
  CardCVCElement,
  useHyper,
} from "@juspay-tech/react-hyper-js";

export default function Checkout() {
  const hyper = useHyper();

 // handle submit for pay button 
 function handleSubmit() {
   // You can follow the same as mentioned in 4. Craft a customized payments experience
 } 

  return (
    <div>
      {/* Render your saved card UI here */}

      {/* CVC Element */}
      <div style={{ marginTop: "16px" }}>
        <CardCVCElement id="card-cvc-element" />
      </div>

      {/* Pay Button */}
      <button onClick={handleSubmit} disabled={isProcessing}>
        {isProcessing ? "Processing..." : "Pay Now"}
      </button>

      {/* Error Message */}
      {message && <div>{message}</div>}
    </div>
  );
}
```


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