Klarna による支払い方法を受け付ける

顧客がアプリで Klarna を受け付ける際に、顧客が支払いを認証するための Webview が表示されます。その後、顧客はアプリに戻り、お客様は支払いが成功したか失敗したかをすぐに確認できます。

# Available as a gem
sudo gem install stripe

# If you use bundler, you can add this line to your Gemfile
gem 'stripe'

import UIKit
import StripePaymentsUI

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        StripeAPI.defaultPublishableKey = 
"pk_test_TYooMQauvdEDq54NiTphI7jx"
        // do any other necessary launch configuration
        return true
    }
}

curl https://api.stripe.com/v1/payment_intents \
  -u "
sk_test_BQokikJOvBiI2HlWgH4olfQ2
:" \
  -d "payment_method_types[]"=klarna \
  -d amount=1099 \
  -d currency=eur

import UIKit
import StripePaymentsUI

class CheckoutViewController: UIViewController {
  var paymentIntentClientSecret: String?

  func startCheckout() {
      // Request a PaymentIntent from your server and store its client secret
  }
}}

let paymentIntentParams = STPPaymentIntentParams(clientSecret: paymentIntentClientSecret)
paymentIntentParams.paymentMethodParams = klarnaParams
paymentIntentParams.shipping = shippingDetails

STPPaymentHandler.shared().confirmPayment(paymentIntentParams, with: self) { (handlerStatus, paymentIntent, error) in
    switch handlerStatus {
    case .succeeded:
        // Payment succeeded

    case .canceled:
        // Payment was canceled

    case .failed:
        // Payment failed

    @unknown default:
        fatalError()
    }
}

失敗した支払い

Klarna は、取引を受け付けるか拒否するかを決定する際に複数の要因を考慮します (買い手が Klarna を使用している期間、顧客が返済する必要のある未払い額、現在の注文の金額など)。

When the customer selects a deferred payment method, Klarna performs a risk assessment before accepting the transaction. Klarna might decline the transaction due to unsatisfactory risk assessment result, the transaction amount involved, or the customer having a large outstanding debt. As such, we recommend that you present additional payment options such as card in your checkout flow. In these cases, the PaymentMethod is detached and the PaymentIntent object’s status automatically transitions to requires_payment_method.

Customers are expected to complete the payment within 48 hours after they’re redirected to the Klarna site. If no action is taken after 48 hours, the PaymentMethod is detached and the PaymentIntent object’s status automatically transitions from requires_action to requires_payment_method.

このようなケースでは、決済フローに表示される別の支払いオプションで再試行するように顧客に通知します。

Klarna のレート制限

API requests to Klarna are subject to additional rate limits beyond Stripe’s API-wide rate limits. These limits can differ depending on the shape of the API requests that you make. In general, if you make more than around 360 requests per minute, you may see some rate limiting in the form of responses with HTTP status code 400 or 402. Please contact us for more details if you’re concerned that your usage may reach these levels, as Klarna may be able to increase these limits on a case by case basis.

エラーメッセージ

Failed Klarna payments normally return one of the following failure codes. These codes show in the last_payment_error API object.