Find a purchase by ID

{
  "data": {
    "id": 0,
    "order_id": 0,
    "product_id": 0,
    "quantity": 0,
    "created_at": "2019-08-24T14:15:22Z",
    "updated_at": "2019-08-24T14:15:22Z",
    "unit_price": 0,
    "unit_price_currency_id": 0,
    "original_currency_id": 0,
    "original_unit_price": 0,
    "currency_rate": 0,
    "formatted_price": "string"
  }
}

{
  "message": "string"
}