Idempotency is a key concept in system operations, ensuring that repeating the same action multiple times doesn’t change the outcome after the first execution. This principle is crucial for maintaining consistency and reliability, particularly in payments integrations, enhancing customer experience and system stability.

Klarna requires idempotent integration of its systems for actions that could change a transaction’s status. This safeguards against unwanted changes or duplications if a request is repeated. To manage this, you can use the Klarna-Idempotency-Key header in all POST and PATCH requests. An idempotency key should be created using the UUIDv5 standard, and is valid for 24 hours - outside of that window Klarna cannot guarantee the idempotency key will be honored with respect to an action.

This enables Klarna to recognize and ignore repeat requests to ensure an action is not unintentionally duplicated. In the case of a duplicate attempt, Klarna will respond with the initial result instead of processing a new one.

To ensure compliance with integration best practices and data protection regulations, you must proactively monitor and share information about deviations from expected behaviors as outlined in the Partner-specific Solution Scope Document. This includes technical errors and unusual activities by customers or, where relevant, accounts or integrations occurring through your integration.

To support monitoring, you are required to meet the following criteria:

  • Immediately escalate any events that disrupt business operations, compromise the integrity or security of information systems, or impact the availability, confidentiality, or integrity of digital assets.
  • Address any disruptions or compromises affecting the operation and reputation of the Klarna payment system.
  • Ensure that all integration approaches must include a specific parameter that uniquely identifies the specific integration being used on that request or transaction. This parameter must be traceable across all integrations to ensure comprehensive incident handling, behavioral tracking, and account management.
  • Follow a release process that validates system functionalities and integration points in the test environment to detect and resolve issues before they impact system performance or customer experience.
  • All interactions with Klarna are tagged with the appropriate integration details and versions as defined in Integration tagging.