Open project

Activate the project for participant responses now. Project must be inactive. To open it later instead, set a scheduled delivery.opening with the update endpoint and do not call this one: the project opens itself at that time.

Optionally pass a delivery body to override audience, closing time, or invitation settings at the moment of opening — without a separate PUT call. All fields are optional.

The invitation is posted only where the project names a place, and today that place is a Discord channel, delivery.invitation.post_channel_id. A project answered on the web (open_web, or private with response_channel web) with no channel opens without posting anything: the response carries data.share_url for you to share and a notice. A project answered in Discord needs the channel and returns 422 channel_required without one.

Go-live validation runs first, as in the Subo app: script errors block the call, and so do warnings the project has not accepted (409 script_validation, listing each finding). Accept a warning by passing its fingerprint in acknowledge; errors cannot be accepted and must be fixed. Run validate first to see them before the audience would.