curl https://api.tradly.app/products/v1/listings/{{listing_id}}/variants \
  -H "Authorization: Bearer YOUR_PUBLISHABLE_OR_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -X POST \
  -d '{
  "variant": {
    "active": true,
    "stock": 2,
    "title": "Add optional title Red",
    "description": "Add optional desccription  L",
    "list_price": 32,
    "offer_percent": 8,
    "variant_values": [
      {
        "variant_type_id": 4,
        "variant_type_value_id": 1
      },
      {
        "variant_type_id": 5,
        "variant_type_value_id": 2
      }
    ]
  }
}'

{
  "status": true,
  "data": {
    "listing": {
      "id": 1
    }
  }
}