Render a clip

Queues a clip for video rendering. Returns a render_id you can use to poll status via GET /renders/{renderId}.

If a template has been applied to the clip (see apply_template), the rendered video will include all template customisations (captions, effects, cropping, etc.). Otherwise the clip is rendered with default settings.

If an identical render has already been completed, returns 200 with from_cache: true and a ready download_url. Returns 409 if the same clip is already being rendered.