Klarna

• Documentation
• Test card numbers

Test E-Mail Accounts

• klarna@green.com -> Open Invoice without selection of payment method
• klarna@yellow.com -> selection of payment methods: open invoice + credit cart
• klarna@red.com -> only credit card

<?php
$url = $this->view->serverUrl();
$config = [
    'purchase_country' => 'AT'
    , 'merchant_reference' => [
        'orderid2' => $paymentInfo->getInternalPaymentId()
    ]
    , 'locale' => 'de-at'
    , 'merchant' => [
        'back_to_store_uri' => $url(['action' => 'payment'])
        , 'terms_uri' => $this->view->serverUrl() . '/agb'
        , 'checkout_uri' => $url(['action' => 'payment']) . '?klarna_order={checkout.order.uri}'
        , 'confirmation_uri' => $url(['action' => 'confirm'], 'payment') . '?klarna_order={checkout.order.uri}'
        , 'push_uri' => $url(['action' => 'confirm'], 'payment') . '?klarna_order={checkout.order.uri}'
        , 'validation_uri' => $this->view->serverUrl() . '/<LINK TO VALIDATE ORDER>?klarna_order={checkout.order.uri}'
    ]
    , 'options' => [
        'color_button' => '#557F0D'
        , 'color_button_text' => '#FFFFFF'
        , 'color_checkbox' => '#FF0000'
        , 'color_checkbox_checkmark' => '#FF0000'
        , 'color_header' => '#EA5B0C'
        , 'color_link' => '#FF0000'
        , 'allow_separate_shipping_address' => true
    ]
];

The cart items

The Klarna provider implementation has currently no fallback to the default checkout manager to extract the cart items. So you have to pass them in the config array $config['cart']['items']. See under "1. Add the cart items" https://developers.klarna.com/en/at/kco-v2/checkout/2-embed-the-checkout

Example implementation:

    $items = [];

    foreach ( $cart->getItems() as $cartItem){

            $item = [];
            $item['reference'] = $cartItem->getProduct()->getOSProductNumber(); // a unique reference for this product / variant
            $item['name'] = $cartItem->getProduct()->getOSName(); 
            $item['quantity'] = (int) $cartItem->getCount();

            $unitPrice = $cartItem->getProduct()->getOSPrice(); // the price for 1 piece
            $item['unit_price'] =  (int) $unitPrice->getAmount()->asRawValue() / 100; // format to integer
            
            $item['discount_rate'] = 0; // mostly implemented via an cart modificator
            $item['tax_rate'] = 0; // can be null, if you don't need tax calculation in the Klarna checkout
            $items[]  = $item; // push it to the items array
     }
     
     $config['cart']['items'] = $items;

Most important is the formatting of the prices, they have to be integers. For example: 20.00 € has to become 2000. Klarna only accepts integers because of avoiding rounding mistakes.

Here is a list for all accepted item fields: https://developers.klarna.com/en/at/kco-v2/checkout-api#cart-item-object-properties