curl --request DELETE \
  --url https://api.shoppex.io/dev/v1/products/{id}/variants/{variantId}/serials \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "serial_ids": [
    "serial_1"
  ]
}
'

{
  "data": {
    "removed_count": 1
  }
}