The v3 API exposes authors on an article as read-only. There is no way to set, replace or remove them — not on PATCH /v3/projects/{project_id}/articles/{article_id}, not on .../articles/{article_id}/settings, and not through any other endpoint I can find in v2 or v3.

Request: accept an authors (or author_ids) array on the article update endpoint, so the credit list can be set explicitly rather than only grown. A dedicated PUT /v3/projects/{project_id}/articles/{article_id}/authors would work equally well. The same applies to categories.