model.Promotion

{
    "course_id": "string",
    "created_at": 0,
    "end_time": 0,
    "goods_id": "string",
    "id": 0,
    "org_id": "string",
    "promotion_price": 0,
    "quantity": 0,
    "start_time": 0,
    "updated_at": 0,
    "used_quantity": 0
}