International fragrance customs, what breaks when you ship a perfume from US to EU / UK / AU / IN?

Fragrance is one of the most-stopped-at-customs categories on earth. Three things break, all preventable:

• HS code mis-classification, perfumes are HS 3303 (perfumes & toilet waters); room sprays + candles + diffusers are HS 3307 (other perfumery / cosmetic / toilet preparations). Mis-coding triggers a customs hold + manual inspection. Magento per-product HS code attribute, auto-populated on the commercial invoice via the ERP / shipping module (ShipStation, EasyPost, Easyship).
• Alcohol content above the limit, many EDPs contain 75-90% ethanol. Some countries (Saudi Arabia, India for personal-use thresholds, certain provinces of Canada) restrict alcohol-content fragrance imports. Magento per-product alcohol_pct attribute + a country-block rule in the checkout.
• Missing IFRA / MSDS, EU customs (and increasingly UK post-Brexit) require IFRA conformity cert + Safety Data Sheet attached to the commercial paperwork for fragrance shipments above a threshold (typically 100ml total). Magento attaches the cert via the shipping module on label generation.

Carrier choice matters: DHL Express handles fragrance customs cleanly across most lanes (and is hazmat-light certified); FedEx International Ground is OK to Canada; USPS is a coin flip and not recommended for fragrance internationally. Budget 7-14 days transit and an 8-15% customs-hold rate even on a well-papered ship; surface this realistically at checkout so customers don’t panic on day 8.