curl --request GET \
  --url http://localhost/api/v3/products/{product}/variants

{
  "data": [
    {
      "id": 123,
      "product_id": 123,
      "sku": "<string>",
      "external_id": "<string>",
      "barcode": "<string>",
      "web_url": "<string>",
      "handle": "<string>",
      "title": "<string>",
      "description": "<string>",
      "position": 123,
      "price": 123,
      "price_discounted": 123,
      "price_comparison": 123,
      "price_cost": 123,
      "available_quantity": 123,
      "images": "<string>",
      "meta": [
        "<unknown>"
      ],
      "tags": [
        "<string>"
      ],
      "options": [
        {
          "name": "<string>",
          "value": "<string>",
          "sort_order": 123
        }
      ],
      "created_at": "<string>",
      "updated_at": "<string>"
    }
  ]
}