Important information

The API reference is now available here.
The deprecated API reference is available here.



Learn more about Sofort and its payment workflow.

Note that no new merchant onboarding is possible for this payment method.
If you are an existing merchant, you can continue to use this product as specified without any changes/updates.

Sofort is a popular online payment method available in Germany and Austria. After selecting Sofort, the customer will be redirected to Sofort, a Klarna service, to initiate an online transfer. Sofort is acting as a payment initiation service and will enable the customer to securely log in to their bank to authorize the payment. Additionally each consumer will need to complete a user account login step for Klarna. Once the authentication and payment are done, the customer can continue shopping in your online shop.

Available inSupported currenciesRedirectRefundPartial refundReversalChargebackRecurringPayout
Austria, Belgium, Germany, Italy, Netherlands, Poland,
Spain, Switzerland
EUR, CHFticktickticktickcrossticktick


  • Payment security: The customer authenticates on their bank site, so there is no confidential data shared between the merchant and the customer.
  • Increased customer confidence: The Sofort/Klarna brand is recognized and trusted by customers, especially those in Western Europe.
  • Supported by all banks in Austria and Germany

Payment workflow

The following diagram explains workflow for Sofort payments.

Sofort workflow

Step 1: Create an Sofort payment type resource. A resource ID is generated in the response and is used in the workflow to complete the payment.

Step 2: Make a charge transaction with the Sofort resource that you created.

Step 3: Forward the customer to the redirectUrl that is displayed in the charge response.

Step 4: Once the customer makes the payment on their bank portal, redirect the customer to the returnURL specified in the initial charge call.

Step 5: After the transaction, display the result to the customer in the front end of the online shop.

Integration options

Quickly integrate with Unzer without any programming knowledge

Use pre-built, configurable all-in-one pages with your own mix of payment methods

Use pre-built forms and quickly integrate with minimum work on the client side

Integrate with Unzer using your own payment form