Introduction

On 27th December, between 14:17 and 14:52 CET Tink’s Payment Initiation product experienced a success rate drop affecting all of our Customers.

Root Cause Analysis

At 14:17 CET Tink implemented a database change to remediate a prior production issue. The change contained a query that put a strain on the database which in turn resulted in the reduction of performance of Tink’s Payment Initiation product.

Remediation

The decision to roll back the affecting change was made immediately after the Incident was reported. Once it was rolled back, the success rate for Payment Initiation quickly returned to normal values.

Follow-up actions

To prevent further Incidents of this kind, we will be implementing the following actions:

1. Tink will improve its database testing methodology in non-production environments to more comprehensively validate the changes before their final deployment in production.
2. The method of deployments in production environments will be changed to allow a much quicker roll back in an event an impact on the service is noticed.