General Notes

Germany

Payment Type	Countries	Currency
Invoice

Danmark

("Pay later")

Austria Denmark Finland Germany

The

Netherlands Norway

Austria

Sweden

Sweden

Switzerland

Euro Danish crowns Norwegian crowns Swedish

crowns

Installment

Swiss Francs

• Danmark
• Germany
• Finland
• The Netherlands
• Norway
• Austria
• Sweden

• Euro
• Danish crowns

• Norwegian crowns

• Swedish crowns

	Installments ("Slice it")
	Direct Debit ("Pay now")

UI Text Box
type note
B2B transactions are not supportedcurrently only supported in Finland, Germany, Norway and Sweden.

API-Requests -

Special Notes /

Deviations

Overview of

Deviations

Clearingtype / Clearingsubtype

Summary

Klarna Checkout is divided in 3 steps.

Create a new session

In the first step you need to setup a new checkout session. You can do so by sending a genericpaynent-request to our server api as listed below.

Please make sure to send the customer data within this request as they're needed to initiate a new session.

Optional

If the customer leaves the checkout page and comes back later, you can update the created session and change for example the address data.

Finalize the checkout ((pre-)authorization)

In the last step, you need to send the authorization token received by Klarna widget as part of the (pre-)authorization request to our server api.

Creating a new session via our server api

In the first step you need to setup a new checkout session. You can do so by sending a genericpamynet-request to our server api as listed below.

Please make sure to send the customer data within this request as they're needed to initiate a new session.

→ Genericpayment start_session

Optional update session

If the customer leaves the checkout page and comes back later, you can update the created session and change for example the address data.

→ Genericpayment update_session

Token-handling via Klarna Widget

Part of the response is a client token. This token needs to be passed to the Klarna Widget. This Widget sends the client token together with the selected payment method (e.g. "Klarna Pay Later") to Klarna to get a authorization token.

→ Widget

Finalizing the checkout ((pre-)authorization) via our server api

In the last step, you need to send the authorization token received by Klarna widget as part of the (pre-)authorization request to our server api.

→ Preauthorization/Authorization

General integration information

There are a few things oyu need to take care of, when itnegrating Klarna checkout in your shop.

• You need to make sure, that the customer didnd't accidently clicked on a Klarna payment method, because you will want to start the checkout preocess and directly send customer data to Klarna via "start_session" call. So please implement another step where the customer needs to confirm his payment method choice.
• After confirmation of the payment method, you want to start witht he first calls to server api as described above and then display the Klarna Widget. This Klarna Widget needs defined parameters to only display the chosen payment method, even if the widget is capable of displaying more than one Klarna payment method. For exmpla,e after selecting Klarna Pay Later, the widget should something like this:
• Image Removed

Request "generic start session"

API parameter

Fixed value "start_session"

Street number and name

(required: at least one character)

Postcode, format [a-zA-Z0-9_.-/ ]{2,10}

Address line 2 (e.g. "7th floor", "c/o Maier")

Customer's IP-V4-address (123.123.123.123) or IP
V6-address

shipping_firstname

Person specific numbers or characters

For KLV / KLS: Item type

Product number, order number, etc.
Permitted symbols:
0-9 a-z A-Z ()[]{} +-_#/:
[n] starting with [1]; serially numbered; max [400]

Unit gross price in cent, max. 19 999 999 99
[n] starting with [1]; serially numbered; max [400]

Quantity
[n] starting with [1]; serially numbered; max [400]

Description
[n] starting with [1]; serially numbered; max [400]

VAT rate (% or bp) of gross price
Mandatory for payment type KLV, KLS
[n] starting with [1]; serially numbered; max [400]

Mandatory for Klarna Installment (KLS): Campaign code

Response "genericpayment - start_session"

API parameter

add_paydata[session_id]

add_paydata[action]=start_session
aid=111111
amount=2222
api_version=1.00
birthday=1958101
city=Neuss
clearingtype=fnc
country=DE
currency=EUR
de[1]=for
ocean use only
email=klarna@approved.de
encoding=UTF-8
financingtype=KLS
firstname=Testperson-de
gender=m
id[1]=boat66
it[1]=goods
key=abcd12345698fffkfk
language=de
lastname=Approved
mid=11111
mode=test
no[1]=1
portalid=2011111
pr[1]=8540
request=genericpayment
salutation=Herr
street=Hellersbergstraße 14
telephonenumber=01522113356
va[1]=1900
zip=41460

Summary

Enabling your customers to pay via Klarna requires you to integrate the Klarna payment method into your checkout process. In order to get an overview of the relationship and interaction on your checkout please see the following diagram. (This diagram is adopted from the official Klarna documentation: Klarna Docs - Offering Klarna payment methods to your customers)

Image Added

Establishing Klarna Checkout is a 3 step process.

Klarna Checkout Processing Sequence

General Integration Information

There are a few things you need to take care of, when integrating Klarna checkout in your shop.

• You need to ensure, that the customer only triggers the session start by deliberately choosing Klarna as a payment method. As personal data will be sent to Klarna, the customer has to actively confirm this (for example: "By selecting this payment method we will send personal data to Klarna. Please confirm.").
• After confirmation of the payment method, you want to start with the first calls to server API as described above and then display the Klarna Widget. This Klarna Widget needs defined parameters to only display the chosen payment method, even if the widget is capable of displaying more than one Klarna payment method. For example after selecting "Klarna Pay Later", the widget should look something like this:Image Added

Overview Client-Side Implementation

Anchor
widget widget

Display Klarna Widget

The following integration steps are taken from Klarna documentation ( https://developers.klarna.com/documentation/klarna-payments/integration-guide/present-klarna-widget )

After creating a new session, you want to present the Klarna widget to your customer. This widget allows you to present all 3 payment methods offered by Klarna to the customer or define what payment method should be presented to the customer. The Klarna widget is rendered using JavaScript SDK. 

<script>
  window.klarnaAsyncCallback = function () {

    // This is where you start calling Klarna's JS SDK functions
    // 
    // Klarna.Payments.init({....})

  };
</script>
<script src="https://x.klarnacdn.net/kp/lib/v1/api.js" async></script>

Klarna.Payments.init({
  client_token: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIifQ.dtxWM6MIcgoeMgH87tGvsNDY6cH'
})

<div id="klarna_container"></div>

Klarna.Payments.load({
    container: '#klarna-payments-container',
    payment_method_category: 'pay_later'
  }, function (res) {
    console.debug(res);
})

{
show_form: true
}

{
show_form: true,
error: {
  invalid_fields: [
    billing_address.street_address
    billing_address.city
    billing_address.given_name
    billing_address.postal_code
    billing_address.family_name
    billing_address.email	]
  }
}

{
show_form: false
}

KKlarna.Payments.authorize({
  payment_method_category: "pay_later"
}, {
  purchase_country: "GB",
  purchase_currency: "GBP",
  locale: "en-GB",
  billing_address: {
    given_name: "John",
    family_name: "Doe",
    email: "john@doe.com",
    title: "Mr",
    street_address: "13 New Burlington St",
    street_address2: "Apt 214",
    postal_code: "W13 3BG",
    city: "London",
    region: "",
    phone: "01895808221",
    country: "GB"
  },
  shipping_address: {
    given_name: "John",
    family_name: "Doe",
    email: "john@doe.com",
    title: "Mr",
    street_address: "13 New Burlington St",
    street_address2: "Apt 214",
    postal_code: "W13 3BG",
    city: "London",
    phone: "01895808221",
    country: "GB"
  },
  order_amount: 10,
  order_tax_amount: 0,
  order_lines: [{
    type: "physical",
    reference: "19-402",
    name: "Battery Power Pack",
    quantity: 1,
    unit_price: 10,
    tax_rate: 0,
    total_amount: 10,
    total_discount_amount: 0,
    total_tax_amount: 0,
    product_url: "https://www.estore.com/products/f2a8d7e34",
    image_url: "https://www.exampleobjects.com/logo.png"
  }],
  customer: {
    date_of_birth: "1970-01-01",
  },
}, function(res) {
  console.debug(res);
})

{
authorization_token: "b4bd3423-24e3",
approved: true,
show_form: true
}

{
approved: false,
show_form: true,
error: {
  invalid_fields: [
              billing_address.street_address
       

       billing_address.city
              billing_address.given_name
              billing_address.postal_code
              

billing_address.family_name
              billing_address.email 

]
  }
}

{
approved: false,
show_form: false
}

Klarna.Payments.authorize(
{ payment_method_category: ‘pay_now’, auto_finalize: false},
{},
function(res) {
// proceed to next checkout page. The finalize_required property in the response indicates
// if finalize is needed or not.
//
// res = {
//   show_form: true,
//   approved: false,
//   finalize_required: true
// }
})

Klarna.Payments.finalize(
{payment_method_category: ‘pay_now’},
{},
function(res) {
// res = {
//   show_form: true,
//   approved: true,
//   authorization_token: ...
// }
})

Overview Server-Side API Calls

Anchor
start_session start_session

Genericpayment start_session

The first step is to setup a new checkout session by sending a genericpayment-request to our server API as listed below. This step is a pre-condition for loading the Klarna widget.

Please make sure to send the customer data within this request as it is needed to initiate a new session. A session will remain valid for 48 hours after the last update.

Total gross amount (in smallest currency unit! e.g.
cent, max. 19 999 999 99)

Currency (ISO 4217)

For KLV / KLS: Item type

Response "genericpayment - update"

API parameter

the follwing integration steps are taken from Klarna documentation ( https://developers.klarna.com/documentation/klarna-payments/integration-guide/present-klarna-widget )

After creating a new session, you want to present the klarna widget to your customer. This widget allows you to present all 3 payment methods offered by Klarna to the customer or define what payment method should be presented to the customer. This is 

Add SDK to your page (insert in body)

<script>
  window.klarnaAsyncCallback = function () {

    // This is where you start calling Klarna's JS SDK functions
    // 
    // Klarna.Payments.init({....})

  };
</script>
<script src="https://x.klarnacdn.net/kp/lib/v1/api.js" async></script>

Initialize SDK and place a container on your page

Klarna.Payments.init({
  client_token: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIifQ.dtxWM6MIcgoeMgH87tGvsNDY6cH'
})

<div id="klarna_container"></div>

Load Klarna Widget

Klarna.Payments.load({
    container: '#klarna-payments-container',
    payment_method_category: 'pay_later'
  }, function (res) {
    console.debug(res);
})

Receive Response from load call

Klarna’s widget uses the show_form:true/false field as a response flag to load and to authorize calls in the Javascript SDK.

Positive Response

If show_form: true, and there are no errors in the object returned, Klarna renders the payment options available to the customer in the widget.

Adjust and try again

If show_form: true, but an error is returned as well, then something is wrong and the consumer needs to take action before moving forward. Klarna will inform the consumer about the details of the error in the widget. Optionally, you can interpret the invalid fields in the error message and take appropriate actions on your checkout page. See the  JavaScript SDK reference page for further information.

Negative Response

If show_form: false, the payment method chosen by the customer will not be offered for this order based on Klarna’s evaluation. A message is displayed to the consumer in the Widget.

When Klarna returns a show_form: false, your store cannot offer the selected payment method to this customer. You need to present other payment methods to the customer.

Request "preauthorization / authorization"

API parameter

Address line 2 (e.g. "7th floor", "c/o Maier")

Date of birth (YYYYMMDD)

Mandatory for Germany, Netherlands and Austria

For KLV / KLS: Item type

Mandatory for Klarna Installment (KLS): Campaign code

add_paydata[authorization_token]=aaa-bbbb-11111-2222-ccc
aid=12346
amount=8540
api_version=3.10
backurl=https://meine.test.url.de/Checkout/back
birthday=19600707
city=Neuss
clearingtype=fnc
country=DE
currency=EUR
de[1]=for ocean use only
email=klarna@approved.de
encoding=UTF-8
errorurl=https://meine.test.url.de/Checkout/error
financingtype=KLS
firstname=Testperson-de
gender=m
id[1]=boat66
it[1]=goods
key=e123dc456a
language=de
lastname=Approved
mid=12345
mode=test
narrative_text=0123456789012345678901234567890123456789
no[1]=1
portalid=2000123
pr[1]=8540
reference=R15595689952007
request=authorization
salutation=Herr
street=Hellersbergstraße 14
successurl=https://meine.test.url.de/Checkout/success
telephonenumber=01522113356
va[1]=1900
zip=41460

Response "preauthorization / authorization"

API parameter

Klarna Invoice: Workorder ID, used for update calls (cart updates)

Klarna Invoice: Reservation ID, used for update calls (cart updates)

redirecturl=https://klarna-payments-eu.playground.klarna.com/v1/sessions/aaa-bbbb-11111-2222-ccc/redirect
status=REDIRECT
txid=30343747
userid=7890123

Capture

Request "capture"

API parameter

Response "capture"

API parameter

• A URL pointing to a PDF of the invoice. (If invoice by post or by e-mail isn’t activated.)
• The URL is valid for 30 days.
• This feature has to be requested.

Debit / Refund

Request "debit"

API parameter

genericpayment

start_session

BASE 64 String

EUR

CHF

DKK

SEK

NOK

CHAR(1..50)

CHAR(1..30)

CHAR(5..254)

RFC 5322

NUMERIC(4)

goods      : Goods

shipment   : Shipping charges

handling   : Handling fee

voucher    : Voucher / discount 

mid=23456 (your mid)
portalid=12345123 (your portalid)
key=abcdefghijklmn123456789 (your key)
api_version=3.10
mode=test (set to „live“ for live-requests)
request=genericpayment
encoding=UTF-8
aid=12345 (your aid)
clearingtype=fnc
financingtype=KIS
amount=3000
currency=EUR
lastname=Approved
firstname=Testperson-de
salutation=Herr
country=DE
language=de
gender=m
add_paydata[action]=start_session
birthday=19600707
street=Hellersbergstraße 14
city=Musterstadt
zip=12345
email=youremail@email.com
telephonenumber=01512345678
de[1]=for the feet
id[1]=socks1
it[1]=goods
no[1]=1
pr[1]=2340
va[1]=1900

068df369-13a7-4d47-a564-62f8408bb760

https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg

https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg

APPROVED

ERROR

status=OK
add_paydata[payment_method_category_asset_url_descriptive]=https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg
add_paydata[client_token]=eyJhbGciOiJSUzI1NiJ9.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.gD6XVLaZeL541T1QYkGsZ01wbAYuTXyhIXcR8irG461U9w1HLugSji4_jc8LsE7cVWMVqLph_CJzCAiZNKzsC9AW6Mf88X8VdR9gV7owv3EVqEdK2K9-g-26Wu2pGE88Um2z2Iz7uUUzbhn6d4rI4CICOLsdaVXJ7MKhzPgnW-a6DM-K9JP2RLIflJKjn3wCjEtJSc_8gqj3_fv8YHaTWRkBd9pUGCBB0rUS-komFAPBdzZiCAbiw5Lsdk9dWpI2wszKeE_iPd6NuxGr4U37XtIX9Gc-uTfn21o0JUJddbiPtItmetWQSY_mruOO4WiVQxuZvxXk7XYwCCb8rrXYw
add_paydata[payment_method_category_identifier]=pay_over_time
add_paydata[session_id]=47a35b08-d5ee-71b5-95d1-eae751c5befb
add_paydata[payment_method_category_name]=Slice it.
add_paydata[payment_method_category_asset_url_standard]=https://x.klarnacdn.net/payment-method/assets/badges/generic/klarna.svg
workorderid=WX1A37YBGD9D11DK

Anchor
update_session update_session

Genericpayment update_session

In order to update the session, e.g. the customer has added a new item tothe cart, you need to send a genericpayment-request with action=update. The call needs to provide the new list of items representing the complete shopping cart.

genericpayment

update_session

068df369-13a7-4d47-a564-62f8408bb760

KIS
KIV
KDD

goods      : Goods

shipment   : Shipping charges

handling   : Handling fee

voucher    : Voucher / discount 

APPROVED

ERROR

Anchor
cancel_authorization cancel_authorization

Genericpayment cancel_authorization

To update an order, you need to send a genericpayment-request with action=update. The call needs to provide the new list of items representing the complete shopping cart.

genericpayment

APPROVED

ERROR

Anchor
authorization authorization

Preauthorization / Authorization

987d6543-f27b-45t5-b378-245465456780

String