Create Content Plan

Generates the blog post briefs for a content plan flow.

A content plan flow stops at KEYWORD_RESEARCH and waits. Call this method to generate the briefs and let the flow continue to SUCCESS, then poll Get Content Plan Flow to follow it. A flow that's only polled never completes.

Called on a flow that already reached SUCCESS, this method regenerates the plan under a separate content plan flow. The response carries the new contentPlanFlowId, and you poll that ID rather than the original. The original flow keeps its own candidates.

Check success in the response as well as the HTTP status. A request that omits contentPlanFlowId reports every failure that way, with success set to false and the reason in message rather than an error. A generation failure reports that way even when you do send the ID.

Call this method once for a flow and wait for it to return. Concurrent calls for the same site can produce duplicate content plans.