Get product variant

curl --request GET \
  --url https://api.shoppex.io/dev/v1/products/{id}/variants/{variantId} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "variant_1",
    "uniqid": "variant_1",
    "product_uniqid": "prod_1",
    "file_id": "550e8400-e29b-41d4-a716-446655440000",
    "dynamic_webhook": "https://example.com/variant-hook",
    "title": "Gold",
    "description": null,
    "price": 12,
    "price_modifier": null,
    "stock": 5,
    "stock_delimiter": null,
    "license_period": null,
    "option_values": {
      "region": "eu"
    },
    "is_default": true,
    "sort_order": 0,
    "created_at": 1711953600,
    "updated_at": 1711953900
  }
}