curl --request POST \
  --url https://app.solya.app/api/restock-plans/{planId}/items \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "quantity": 12,
  "shopId": "shop-uuid-paris-opera",
  "sizeId": "sz-uuid-43",
  "variantId": "var-uuid-adidas-stan"
}
'

{
  "itemId": "rsi-uuid-002",
  "success": true
}