# Klarna
Checkout can be used to accept Klarna payments.
Integration options supported: Hosted payment page (HPP) or IFRAME.
This guide requires familiarity with [Accepting payments](/online-payments/checkout/accepting-payments.md).
## Integrate Klarna via Checkout
| Parameters | Type | Description |
| ----------------------- | ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `currency_code` | String (**required**) | Supported currencies: EUR, DKK, NOK, SEK, USD |
| `amount` | Integer (**required**) | Transaction amount |
| `configurations.klarna` | Object (**required**) | Object carrying the parameters required for making a Klarna payment |
| `customer` | String (**required**) | ID of a Customer created via the [Customer](/api-reference/open-api-references/customer.md) API. A customer object can be created and attached to a Checkout. Supported Countries ('US', 'NO', 'SE', 'FI', 'DK') |
| `capture_now` | Boolean (**optional**) | Used for separate authorization and capture |
| `line_items` | Array of objects (**required**) | Each line item represents a product in the checkout |
## Authorization and capture
Klarna transactions through the Checkout can be used to do a sale (`capture_now` = **true**) or to authorize without capturing immediately (`capture_now` = **false**). An authorized payment reserves the money and allows you to capture the funds at a later stage.
## Handling responses
Whenever a card payment is processed via the Checkout, the responses events would contain additional fields specific to card payments in the `details` object.
Sending a checkout request using Klarna payment method:
```json
{
"amount": 12054,
"currency_code": "EUR",
"entity_id": "030288dd-97fd-449e-9753-1a8195d92c56",
"customer": "53fc359e-7cb0-4bd5-94d6-8f7f2ef48511",
"configurations": {
"klarna" : {
"capture_now": false
}
},
"line_items": [
{
"name": "Demo product",
"quantity": 1,
"tax_rate": 0,
"total_tax_amount": 0,
"total_amount": 12054,
"unit_price": 12054
}
],
"merchant_reference": "ORDER-9671",
"return_url": "https://enzxiezwyvbcusi.m.pipedream.net",
"interaction_type": "HPP"
}
```
Example of successful checkout via the Checkout:
```json
[
{
"type": "TRANSACTION_INITIATED",
"id": "a4eb96fd-f448-420c-b2f8-e8dd758513c4",
"timestamp": "2021-09-23T12:08:38.970Z",
"details": {
"id": "551deb6b-1bd1-46e6-bf36-a18555212b1a",
"instore_reference": "9123285100004542",
"client_token": "eyJh******ZaoA",
"payment_method_categories": [
{
"identifier": "pay_over_time",
"name": "Slice it.",
"asset_urls": {
"standard": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg",
"descriptive": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg"
}
},
{
"identifier": "pay_later",
"name": "Pay later.",
"asset_urls": {
"standard": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg",
"descriptive": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg"
}
},
{
"identifier": "pay_now",
"name": "Pay now.",
"asset_urls": {
"standard": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg",
"descriptive": "https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg"
}
}
],
"amount": 11703,
"blocked": false,
"customer": "53fc359e-7cb0-4bd5-94d6-8f7f2ef48511",
"details": {
"auto_capture": false
},
"merchant_reference": "ORDER-5632",
"processor": "KLARNA",
"payment_product": "KLARNA",
"payment_product_type": "Klarna",
"status": "INITIATED",
"created_by": "cfc403f7-95a3-4c84-b9fd-2e18c37e488d",
"shopper_interaction": "ECOMMERCE",
"geo_location": [
26.9261,
75.7928
],
"city": "Jaipur",
"country_code": "FI"
}
},
{
"type": "TRANSACTION_SUCCESS",
"id": "7ce36c1e-bc31-4958-bb30-fd3f52a6291f",
"timestamp": "2021-09-23T12:13:00.514Z",
"details": {
"id": "551deb6b-1bd1-46e6-bf36-a18555212b1a",
"instoreReference": "9123285100004542",
"authorizedPaymentMethod": {
"paymentType": "INVOICE"
},
"amount": 11703,
"createdAt": "2021-09-23T12:08:38+01:00",
"details": {
"autoCapture": false,
"mid": "K043993"
},
"merchantReference": "ORDER-5632",
"processor": "KLARNA",
"paymentProduct": "KLARNA",
"paymentProductType": "Klarna",
"shippingInformation": {},
"status": "AUTHORIZED",
"shopperInteraction": "ECOMMERCE",
"countryCode": "FI"
}
}
]
```
Example of failed Klarna payment via the Checkout:
```json
[
{
"type": "TRANSACTION_FAILED",
"id": "63fb2e62-4d16-4f85-9886-7f66f7f09ab1",
"timestamp": "2021-09-23T12:46:48.404Z",
"details": {
"code": 404,
"details": {
"error": "404 : [{\n \"error_code\" : \"NOT_FOUND\",\n \"error_messages\" : [ \"Invalid authorization token\" ],\n \"correlation_id\" : \"bb668631-360c-4af7-baaf-fcc419ce1ac1\"\n}]",
"serviceCode": "KLARNA"
},
"timestamp": 1632401208387,
"message": "The requested resource, or one of its sub-resources, can't be found. If the submitted query is valid, this error is likely to be caused by a problem with a nested resource that has been deleted or modified. Check the details property for additional insights."
}
}
]
```
{% hint style="info" %}
To ensure that the redirection request was not tampered with, always check that the `transaction_id` received as query parameter in the redirection matches the `transaction_id` property of the retrieved Checkout. If those are not matching, this is indication of either an incorrect integration, that the redirection to your `return_url` did not originate from Verifone, or `transaction_id` was tampered with.
{% endhint %}
You can now store the `transaction_id` value together with the order 1234 in your system to link the two together.
## Scenarios
The table below describes the different outcomes of a Checkout. A full list of [error codes](/api-reference/open-api-references/checkout.md) are available.
| Description | Result | Merchan action |
| ---------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| Failed transaction\* | Redirect: `checkout_id={checkout_id} & transaction_id={transaction_id} & errorCode=123` | Unsuccessful payment (technical reason), do not display order confirmation |
| Successful transaction | Redirect: `checkout_id={checkout_id} & transaction_id={transaction_id}` | Display order confirmation |
| Customer visits the URL of an already completed Checkout | Redirect: `checkout_id={checkout_id} & errorCode=168` | Display corresponding message to the customer. Checkout is completed whenever there was a single successful payment processed through it. |
| Customer visits the URL of an expired Checkout | Redirect: `checkout_id={checkout_id} & errorCode=169` | Display corresponding message to the customer. Checkout is expired whenever the expiry\_time is reached |
| Customer visits the URL of a Checkout which has reached the maximum of failed payment attempts | Redirect: `checkout_id={checkout_id} & errorCode=165` | Display corresponding message to the customer. Payments through a single Checkout can be attempted up to three times unsuccessfully. |
| Form validation errors / Other service failures on the Checkout page | Displays error alert to Customer on the page | Customer is prompted to correct their form input and retry the payment or try using alternate card or the payment method |
{% hint style="info" %}
\* Failed transaction - Depending on which step in the payment process failed, the `transaction_id` might not always be present as the query parameter.
{% endhint %}
---
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