curl --request PUT \
  --url https://production.trackstarhq.com/cart/products/{product_id}/trackstar-tags \
  --header 'Content-Type: application/json' \
  --header 'x-trackstar-access-token: <x-trackstar-access-token>' \
  --header 'x-trackstar-api-key: <x-trackstar-api-key>' \
  --data '
{
  "trackstar_tags": [
    "tag1",
    "tag2",
    {
      "tag3": "value3"
    }
  ]
}
'

{
  "id": "id",
  "unused_fields": [
    "<string>"
  ],
  "data": {
    "id": "product_id",
    "created_date": "2022-01-01T00:00:00Z",
    "updated_date": "2022-01-02T05:05:05Z",
    "name": "product_name",
    "sku": "sku",
    "gtin": "gtin",
    "parent_product_id": "<string>",
    "is_kit": true,
    "active": true,
    "image_url": "https://example.com/image.jpg",
    "price": 10,
    "unit_cost": 10,
    "inventory": 10,
    "inventory_by_warehouse_id": {
      "warehouse_id_1": 6,
      "warehouse_id_2": 4
    },
    "measurements": {
      "length": 1.5,
      "width": 1.5,
      "height": 1.5,
      "unit": "in",
      "weight": 2.5,
      "weight_unit": "lb"
    },
    "tags": [
      "tag_0"
    ],
    "categories": [
      "Apparel",
      "Shoes",
      "Running"
    ],
    "external_system_url": "https://example.com/cartproduct/123",
    "trackstar_tags": [
      "tag1",
      "tag2",
      {
        "tag3": "value3"
      }
    ],
    "additional_fields": {
      "key": "value"
    }
  }
}