# Headless SDK

### Customize the payment experience using Headless functions

#### 1. Initialize the Juspay 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).

```kotlin
// dependencies: implementation 'io.hyperswitch:hyperswitch-sdk-android:+' val 
paymentSession = PaymentSession(applicationContext, "YOUR_PUBLISHABLE_KEY")
```

#### 2. Create a Payment Intent

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`

```kotlin
paymentSession.initPaymentSession(paymentIntentClientSecret)
```

| 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` function, using which you can confirm and handle the payment session.

<pre class="language-kotlin"><code class="lang-kotlin"><strong>var handler: PaymentSessionHandler? = null
</strong>
paymentSession.getCustomerSavedPaymentMethods { paymentSessionHandler ->
    handler = paymentSessionHandler
}

val savedPaymentMethod = handler!!.getCustomerLastUsedSavedPaymentMethodData()

button.setOnClickListener { 
    handler!!.confirmWithCustomerLastUsedPaymentMethod { paymentResult -> 
        println(paymentResult)
    }
}
</code></pre>

**Payload for** `confirmWithCustomerLastUsedPaymentMethod(callback)`

<table><thead><tr><th width="296">options (Required)</th><th>Description</th></tr></thead><tbody><tr><td><code>callback (method)</code></td><td>Callback to get confirm response.</td></tr></tbody></table>