curl --request POST \
  --url https://api.gameboost.com/v2/item-orders/{itemOrder}/complete \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": 123,
    "item_offer_id": 123,
    "game": {
      "id": 123,
      "name": "<string>",
      "slug": "<string>"
    },
    "buyer": {
      "id": 123,
      "username": "<string>"
    },
    "rating": {
      "id": 123,
      "labels": [
        "<string>"
      ],
      "rating": 123,
      "comment": "<string>",
      "created_at": 123,
      "updated_at": 123
    },
    "title": "<string>",
    "description": "<string>",
    "quantity": 123,
    "parameters": {},
    "status": "pending",
    "delivery_time": {
      "duration": 123,
      "unit": "minutes",
      "format": "<string>",
      "format_long": "<string>",
      "seconds": 123
    },
    "price_eur": "<string>",
    "price_usd": "<string>",
    "unit_price_eur": "<string>",
    "unit_price_usd": "<string>",
    "created_at": 123,
    "updated_at": 123,
    "purchased_at": 123,
    "completed_at": 123,
    "refunded_at": 123
  },
  "message": "<string>",
  "action": "<string>"
}