Guides
What actually goes wrong when working with Japan’s business registers.
How to validate a Japanese invoice registration numberCheck a Japanese qualified invoice issuer registration number properly: format, check digit, whether it is registered, and whether it was valid on the invoice date.Working with Japan’s corporate number (法人番号) APIWhat the NTA publishes, what its Web-API does and does not give you, and when hosting your own copy stops being worth it.Why matching Japanese company names is hardGaiji, variant characters, width, and where 株式会社 sits. What actually goes wrong when matching Japanese company names, and why string equality fails.