Trigger Content Plan Generation Flow

Creates and starts a content plan flow for a site.

Generation runs asynchronously and takes several minutes. This method returns a contentPlanFlowId as soon as the flow is created, before any content is generated. Poll Get Content Plan Flow with that ID to follow the flow's progress.

A successful response means the flow was created, not that generation succeeded. Check status rather than relying on the response alone.

The flow stops at KEYWORD_RESEARCH and waits. Call Create Content Plan to generate the blog post briefs and let the flow continue to SUCCESS.

A failed flow is retried automatically, and each retry creates a separate flow with its own ID. The original flow keeps its FAIL status, so call Get Content Plan Flow without an ID to retrieve the site's most recent successful flow.