Updates a step's configuration or display name in the draft sequence. config is merged over the existing config — send only the keys you're changing. Patch a wait step's delay and unit to change the gap between two steps.

This writes the draft. Call Publish Sequence to make it live.

Concurrent writes are safe — overlapping calls to one campaign serialize, and every change is kept. A sequence builder open in the browser saves its own copy of the whole graph, so an edit made through the API while that canvas is open is overwritten by the next canvas save.

{
  "data": {
    "node_id": "send-m2k9x1p-0"
  }
}