Machine-detectable response code for "Password confirmation is required"

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Background

I am using the Nextcloud API to create users, groups and similar from an external software (a Drupal website).
I noticed that cookie auth is the fastest, token auth is a bit slower, basic auth is a lot slower.
With both cookie auth and token auth, I get responses "Password confirmation is required" on routes annotated with @PasswordConfirmationRequired every 30 minutes.
The response json is like this:

{"ocs":{"meta":{"status":"failure","statuscode":403,"message":"Password confirmation is required","totalitems":"","itemsperpage":""},"data":[]}}

In my code I am checking for $data['ocs']['meta']['statuscode'] === 403 && $data['ocs']['meta']['message'] === "Password confirmation is required". If the check is positive, I clear the cookies and send another request.
(I am using cookie auth, but the same would happen with token auth)

Problem

My check relies on a user interface string, which might change in future versions of Nextcloud.

Request

Send another special string with the response, that is more reliable to detect.
BUT
Don't remove any of the existing parts of the response, so not to break other clients.
OR
Make a commitment that the string "Password confirmation is required" is not going to change, ever.

Start by tracing the routes annotated with @PasswordConfirmationRequired and the code that builds their OCS response. Check how the existing 403 response is tested, then define a machine-detectable value while preserving the current response fields and wording for existing clients.