Integration guide for how to integrate Klarna Checkout in your iOS app, using the native integration.
This guide will teach you how to:
The components in the native approach are:
In your mobile app you will need to fetch a Klarna Checkout HTML snippet from your web server. This integration guide will not go through the Klarna Checkout integration in detail, but assumes it has been set up already and is available at an API endpoint YOUR-URL on your servers. If needed, you can learn how to do it in the regular Klarna Checkout Integration guide here.
To initialize the Klarna Checkout in your native flow, create a KlarnaCheckout object and supply a Checkout HTML snippet hosted at YOUR-URL :
|initWithViewController||UIViewController||The View Controller that will contain the checkout view|
|returnURL||NSURL||URL schema as defined in your info.plist to return from external applications. Learn more about it here|
Setting the snippet will start preloading the checkout, which ensures a better experience for the users.
You have two options for presenting the Klarna Checkout view:
If you want to display this view controller taking all screen space, you can use it as usual by pushing it in your navigation stack:
Or, if you want to integrate it in your own native checkout flow, you can add the checkoutViewController as a childViewController and handle resize events for the checkout.
First, you need to disable internal scrolling and supply a sizing delegate implementing KCOEmbeddableCheckoutSizingDelegate. This will make the viewController fill its internal scrollview to its parent and not scroll.
You are then responsible for resizing the checkout view to be as big as it needs to be. To do this, you’ll need to implement the resize method. At this point, whether you manually set frames or use autolayout is totally up to you.
To handle the signals received from the SDK, you should set up an observer listening to the KCOSignalNotification. To ensure the checkout shows the successful screen, you need to load confirmation HTML snippet upon receiving the complete message.
You may also want to set up event listeners to track field changes in the Klarna Checkout before the order is placed. See the reference guide for what events are available.
When a server-side call to Klarna is being processed, you can trigger the 'suspend' action to prevent the user/customer from altering the state of their Checkout order. The suspend action will turn the Klarna Checkout unresponsive to user interactions.
After the server-side call to Klarna has been processed, you should trigger the 'resume' action to once again let the user interact with Klarna Checkout.
If you wish to handle external payment methods (such as PayPal, Google Pay, etc), you can turn on the following feature flag in the SDK. By doing so, the Klarna Checkout will not handle the external payment methods automatically:
Whenever the SDK reaches an external payment method selected by the customer, you will receive an event named 'external' in your callback with a 'uri' parameter pointing to the external payment’s URL:
If you wish to handle validation errors and you don’t want Klarna Checkout to show a pop-up window showing the errors, you can turn on the following feature flag in the SDK:
Whenever the SDK detects a validation error, you will receive an event named 'validation_error' in your callback with 'error_type' and 'error_text' parameters:
Some payment methods require authorization through third-party applications. These can return to your application upon completion, but to do that, you need to supply a URL that should be used for returning. There do not need to be any special handlers on application load for that URL. Our only requirement is that the user is returned to your application from the third-party application.
In cases where the user needs to authenticate with their bank for credit card payments, the bank itself might open a third-party app such as Bank ID. Since the SDK does not create these sessions, the user would have to return to the app manually, and then you will get the completion signal from the checkout.
Success! You now have Klarna Checkout up and running in your mobile app.
Check out our git-hub page where you can