Klarna Datev accounting interface

With Klarna and AccountOne you can save more time on accounting

You want to focus more on your sales and spend less time on accounting? You want a fully automated interface between Klarna and your accounting? Then AccountOne is the right choice for you.

Over 9,000,000 online orders and the associated payments pass through our system - every month! You too, like >3,500 other online retailers, trust the most powerful platform.

With AccountOne you can...

  • Connect Klarna with your tax advisor
  • Synchronize several Klarna accounts with your tax advisor at the same time
  • Have incoming payments + fees automatically converted into perfect accounting data and linked to revenues
  • save yourself and your tax advisor a lot of time

Preparing accounting with Klarna has never been so easy...

Connect Klarna with just a few clicks

With just a few clicks, you can connect your Klarna account to AccountOne. We'll take care of the rest for you together with your tax advisor. You can find out how easy the connection is in our helpdesk. We also provide your tax advisor with comprehensive onboarding support.

Fully automated data retrieval

Our API interface retrieves data from Klarna several times a day and provides it as accounting data on a monthly basis.

Matching with invoices

The payment transactions are automatically assigned to the invoices (provided the invoicing system is also connected to AccountOne). The fee items and payouts are also posted fully automatically.

100% DATEV compatible export

Our exports are fully batch processable. This means that no import profiles have to be created in the accounting department, but can be imported directly using the DATEV board tools.

Minimally invasive integration

AccountOne integrates into the existing API and tech stack without interfering with other systems.


Directly accessible via web browser without installation. 24/7 Up-to-Date!

Contemporary man browsing in touchpad

The data can be retrieved fully automatically via API with just a few clicks. We have provided detailed instructions for this in the helpdesk.

Once the data from the payment service provider Klarna has been imported into AccountOne for accounting with DATEV, the system begins to assign the individual payment transactions to the corresponding invoices from the online store or the invoice (in the case of SaaS). The assignment is made using special transaction identifiers that are already contained in the order data from the online store or the data from the invoice.

This assignment also makes it possible to address the correct debtor. It is therefore not necessary to intervene manually in DATEV.

Klarna is handled like a separate bank account for accounting purposes in DATEV. This "fictitious" bank account is then used to post incoming payments from customers as well as the individual transaction-based fees and payouts to the correct bank account. This is comparable to the booking method of a cash register.

Payments to the bank account are posted via cash transit and match the incoming funds in the bank account at 100%. This enables easy reconciliation in DATEV.

AccountOne provides a DATEV-compatible CSV record for the payments from Klarna every month. This is regularly checked with the DATEV checking tools and guarantees a smooth import to DATEV. In addition, our export to DATEV is batch processable.

You therefore do not have to create an ASCII import, but can use the DATEV board tools to read in the data. This prevents errors during import.

Customer testimonials

AccountOne Features

AccountOne means being able to map all sales and payment channels on one platform. We developed AccountOne for this purpose in close cooperation with tax firms and online retailers. The result is a high-performance software that can be individually tailored to the needs of both sides. In addition to classic online trading transactions, AccountOne also maps almost all special cases in online trading. We like to face new challenges and master them together with our customers.

Online retailer

AccountOne can be used to service the following types of online merchants:


  • Micro-merchants
  • Small traders
  • Medium traders
  • Large dealers (group)
  • Multichannel retailer
  • Omnichannel retailer
  • Amazon FBA and EFN, PAN-EU
  • Dropshipper
  • SaaS provider
  • App provider

Tax cases

AccountOne can be used to handle the following types of tax cases:


  • Target taxation
  • Actual taxation
  • Small business
  • PAN-EU and EFN
  • OSS & IOSS
  • B2B deliveries
  • (Cross-border) series transactions
  • Amazon Consignment Stock
  • UK deliveries
  • Vouchers
  • Mixed baskets (UST. rate)


AccountOne can be fully customized in the following ways:

  • Account assignment revenues
  • Account assignment debtors
  • Account assignment to expense accounts
  • Account assignment payment accounts
  • Commingling account assignment
  • Account assignment shipments
  • Length of accounts (4-12 digits)
  • Individual booking keys
  • Individual OSS booking keys
  • Contents DATEV Export (additional columns)


Each API import can be customized specifically for the online merchant:


  • Adjustment order date, payment date, delivery date
  • Exclusion of certain orders (e.g. Amazon connected to Shopify)
  • Import of POS data (Shopify POS)
  • B2B UST ID Import
  • Multichannel retailer
  • Omnichannel retailer
  • Import of invoice numbers (e.g. WooCommerce)

Additional functions

AccountOne offers a wide range of additional features:

  • Pro forma invoices
  • Qualified verification of UST-ID numbers
  • Measurement article performance Amazon
  • Amazon inventory valuation
  • Delivery threshold monitoring (Until 06/2021)
  • Power threshold monitoring OSS 
  • Exports VAT Compliance


AccountOne can provide the following exports:

  • Accounting
    • DATEV-compliant exports (EXTF) 
    • Batch processable exports
    • Special exports for BMD
    • Special exports for ED-Rewe
    • Special exports for SAP
  • VAT Compliance
    • Special exports for AccountVAT
    • Special exports for AmaVAT
    • Special exports for dutypay

Other interfaces

14 days free & full trial

Includes 3 backdated monthly exports, full access to the software and access to all support resources (helpdesk, email & phone).