Your checkout screen when Klarna is selected as payment method.	Hosted Payment Page flow starts when customer confirms to Continue with Klarna.	Your order confirmation screen after a successful payment.

Integration Steps

• Prepare: Make sure you have a web checkout integrated with Klarna Payments.
• Set up your app (Mobile App): Set up return URL to your application.
• Present your web checkout (Mobile App): Present you web checkout using System WebView.

This guide will lead you through all the steps required to accept Klarna Payments in your mobile app using your web integration. At the end, you will be able to accept payments with Klarna with very few native changes.

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Klarna purchase flows might require authorizations in other applications (e.g. bank apps) or do a handover to the Klarna app. In such cases, a return URL to your application ensures seamless return to the flow in your app, hence setting up a return URL is required. It is expected that redirects to this URL should only open your application without any changes in the UI state, ensuring the customer can continue the flow prior to external navigation.

You can read more about how deep links and intent filters work on the Android Developers site.

You can set up a Return URL app scheme for your application by registering an intent-filter for the Activity you integrated Klarna, in your app’s AndroidManifest.xml:

<application...>
    <activity...>
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="<your-custom-scheme>" />
            <data android:host="<your-custom-host>" />
        </intent-filter>
    </activity>

override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)
    intent?.data?.let { uri ->
        if (uri.host == Contants.klarnaReturnUrl.host && uri.host == Contants.klarnaReturnUrl.host) {
            // This is a return URL for Klarna – skip deep linking
            return
        }
        // This was not a return URL for Klarna
    }
}

As Android Custom Tabs will be shown to the customer during the flow, we require Activity set up for intent-filter to finish immediately and retain Custom Tabs on top.

class RedirectActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        handleRedirect(intent)
    }

    override fun onNewIntent(intent: Intent?) {
        super.onNewIntent(intent)
        handleRedirect(intent)
    }

On Android, system WebViews are commonly implemented using Android Custom Tabs. By default, Custom Tabs share cookies and session data with the device’s default browser (e.g., Chrome or Firefox). This shared session capability is essential for Klarna, as it allows us to recognize returning customers across sessions and provide a seamless checkout experience.

While it's possible to disable session sharing using Ephemeral Custom Tabs, we require persistent (non-ephemeral) sessions as this functionality enables Klarna to maintain customer context across the device.

dependencies {
    implementation 'androidx.browser:browser:<latestVersion>'
}

val customTabsIntent = CustomTabsIntent.Builder()
    .setEphemeralBrowsingEnabled(false) // only available in android.browser version 1.9.0
    .build()

customTabsIntent.launchUrl(this, sessionUrl.toUri()) // URL of your web checkout for this customer session

Redirect back to your app

After the purchase is completed, Klarna payment flow will be closed and the customer will be taken back to your checkout page where you will be notified for the authorized session in your web integration. From your checkout or the confirmation page, you can choose to redirect the customer back to your application.

To get the user back to your application from System WebViews, you can redirect to any intent-filter set for the Activity that you want to return to from your checkout or confirmation pages, as those will be loaded in the System WebView.

Klarna purchase flow in System WebView.	Your checkout page in System WebView.	Your confirmation page in System WebView.

Klarna Mobile SDK provides a full suite of mobile-first integrations, including Klarna products like:

Sign in with Klarna	On-site Messaging	Express Checkout

• On-site Messaging: Show contextual messaging let your customers know about the available payment options in pre-checkout: click here to learn more.
• Sign in with Klarna: Seamlessly identify and let users login via their Klarna account: click here to learn more.
• Express Checkout: Accelerate your checkout process and boost conversion by offering a one-click checkout, click here to learn more.

Complete your integration with

• Order management
• Settlements
• End-to-end testing
• Prepare for go live