routing number 231381116

KR123456789012 fails IBAN checksum. Official BankDataStack sample: GB82WEST12345698765432. Starter $49.99/mo, 7-day trial.

A UK IBAN BBAN API returns countryCode, checkDigits, and bban as JSON. BankDataStack POST /api/v1/iban/validate. Official sample: GB82WEST12...