IBAN Country Code Mismatch Fix
Resolve frequent IBAN validation failures caused by country-code and bank-rule inconsistencies.
1. Compare IBAN prefix with expected account jurisdiction rules.
2. Validate IBAN length and structure for the detected country.
3. Recalculate check digits after any formatting normalization.
4. Reject mixed separators and hidden unicode characters.
5. Align onboarding UI hints with backend country validations.
6. Log failures by country to detect integration regressions.
Implementation notes
Keep country-specific validation rules versioned and testable. Banking rails and local standards can change over time, and stale validation logic silently increases payment failure rates.
Related pages
FAQ
Can formatting alone fix IBAN errors? Formatting helps readability, but check digits and structure still must validate.
Should I auto-correct country prefixes? Only with explicit user confirmation to avoid accidental account mismatch.