You are an approved KID or ZAD here in short the steps to use the productive environment of the XS2A API.
The current productive version of the XS2A API is based on the Berlin Group specification.
Accessibility: 24/7
The productive environment of the XS2A interface is basically accessible via
https://xs2a.f-i-apim.de:8443/fixs2aop-env/xs2a-api/<bankcode>, where the "<bankcode>" represents the German BLZ (bank code).
A list of international trust centers can be found here, these trust centers are supported in the productive context. It should be noted that only test certificates of the listed trust centers are supported on the sandbox system.
Like the productive interface, the Sparkassen-Finanzgruppe sandbox is based on the XS2A interface specification "NextGenPSD2" of the European standardization initiative of the Berlin Group.