How do I validate UEN for B2B customers in Magento?

UEN (Unique Entity Number) is Singapore’s business identifier, mandatory for every registered company, society, and government entity. For B2B Magento stores, UEN validation gates trade-account registration. Two approaches:

• Format validation, regex check on the UEN format (9-digit business, 10-digit local company, 10-digit foreign company, etc.). Catches typos but doesn’t verify existence.
• Live API validation, we wire to ACRA BizFile API (Singapore’s Companies Registry) to verify UEN + entity name + status (active / struck-off). Cached for 24h.

For Adobe Commerce B2B, this slots into company table as a custom attribute. Approval workflow: customer registers with UEN → auto-validate → admin approves → trade pricing unlocked. We also add GST-number validation for input-tax claim invoicing.