Feedback API URL construction

Hi,

First of thank you for the great on-premise repo and further documentation! We have recently made the switch to self hosting Sentry due to a client who needed further data ownership guarantees. Our instance is running wonderfully, however, I am looking to construct the URL which allows some javascript logic to send user feedback. Previously we simply followed:

{base_url}/api/0/projects/{organization_slug}/{project_slug}/
With an authorization header set for DNS {dsn}.

However, this pattern does not hold for the on-premise instance (or something else is broken).

What is the correct construction of the URL or how should I find out?

The answer is still out, could anyone shed some light on this?