curl --request GET \
  --url https://app.solya.app/api/inventory/variants/{productId} \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "shopId": "shop-uuid-paris-opera",
      "shopName": "Paris Opéra",
      "size": "41",
      "sizeId": "sz-uuid-41",
      "stock": 3,
      "variant": "White / Black",
      "variantId": "var-uuid-nike-air-wb"
    },
    {
      "shopId": "shop-uuid-paris-opera",
      "shopName": "Paris Opéra",
      "size": "42",
      "sizeId": "sz-uuid-42",
      "stock": 8,
      "variant": "White / Black",
      "variantId": "var-uuid-nike-air-wb"
    },
    {
      "shopId": "shop-uuid-lyon-bellecour",
      "shopName": "Lyon Bellecour",
      "size": "42",
      "sizeId": "sz-uuid-42",
      "stock": 2,
      "variant": "White / Black",
      "variantId": "var-uuid-nike-air-wb"
    }
  ]
}