put https://api-sandbox.data.one/v1/sessions/completed
When the user completes their session with us, they will be redirected to the partnerRedirectUrl you originally provided to us along with a sessionTerminationToken appended to the query string, like so:
https://<your-host>/some/path?sessionTerminationToken=XXXX
You can now call this endpoint with the sessionTerminationToken as the Authorization header. You will receive the same Session Response as in the POST call. This will classify the Session as COMPLETED and a user will not be able to generate further open banking products.