Your checkout screen when Klarna is selected as payment method.	Klarna purchase 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.

Add the Repository

Add the Klarna Mobile SDK maven repository:

Add the Dependency

Add the SDK as a dependency to your app:

Return URL

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
    }
}

In order to use your web integration in the app, first step would be to create a WebView for loading your checkout URLs. You can simply do this by initiating the WebView first.

Retrieve WebView inflated from XML

val webView = findViewById(R.id.webView)
webView.webViewClient = this
webView.loadUrl("https://www.merchant.com/checkout") // Load your checkout page where Klarna Payments is integrated

Create a new WebView from code

webView = WebView(context)
webView.webViewClient = this
webView.loadUrl("https://www.merchant.com/checkout") // Load your checkout page where Klarna Payments is integrated

Initialize the Hybrid SDK by creating a new instance of KlarnaHybridSDK. You should hold a strong reference to the SDK. It will deallocate all its resources if you null it. You only need a single instance of the SDK, regardless of how many web views you have, but if you need to, you can create several SDKs.

val hybridSDK = KlarnaHybridSDK(returnUrl, null, null)
hybridSDK.eventHandler = this

The SDK will notify you of events and errors via event callback object that you’ll need to implement. The SDK also notifies you about different events during fullscreen transition via fullscreen event callback.
You will need to implement the KlarnaEventHandler interface in order to receive events and errors from the SDK. This will let your app be notified about relevant events and errors that happen inside the web view that the SDK is observing.

    class MyActivity: AppCompatActivity(), KlarnaEventHandler {
        override fun onEvent(klarnaComponent: KlarnaComponent, event: KlarnaProductEvent) {
            // Implementation for dispatched event
        }

        override fun onError(klarnaComponent: KlarnaComponent, error: KlarnaMobileSDKError) {
            // Implementation for encountered error
        }
    }

You need to add the web views that the SDK should track. The SDK will hold weak references to these web views, so if they’re deallocated, the SDK will lose track of them.

hybridSDK.addWebView(webView)

There are two instances at which you’ll need to notify the SDK of events in your web view (as we don’t override your WebViewClient).

Before a Navigation

You should notify the SDK about upcoming navigations by calling the SDK’s shouldFollowNavigation from your WebViewClient.

class MyWebViewClient(): WebViewClient() {
    override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
        return !hybridSDK.shouldFollowNavigation(url)
    }
}

After a Navigation

You need to notify the SDK after a page has loaded by calling the SDK’s newPageLoad from your WebViewClient.

class MyWebViewClient(): WebViewClient() {
    override fun onPageFinished(view: WebView, url: String) {
        hybridSDK.newPageLoad(view)
    }
}

The SDK will log events and errors while it’s running, which you can read in logcat console. You can set the logging level for the SDK through the loggingLevel property of integration instance.

hybridSdk.loggingLevel = KlarnaLoggingLevel.Verbose

KlarnaLoggingLevel

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 (Mobile SDK support available soon).

Complete your integration with

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