Accept or reject an item

Marks a quote item as accepted or rejected. `{itemId}` may be a line item id OR an alternative id (auto-detected). Accepting an item rejects its pending alternatives; accepting an alternative rejects its siblings.

{ "action": "accept" }

{
  "data": {
    "id": "8a2b1c3d-4e5f-6071-8293-a4b5c6d7e8f9",
    "type": "item",
    "status": "accepted"
  }
}