how to validate NZBN code number of NewZealand? - stripe-payments

Question

I am working on app needs an NZBN Code to register with stripe payments, when a user can enter any NZBN that cause Stripe issues,
i entered the https://api.business.govt.nz/services/v4/nzbn to check it but no obivious api call contain the real check of the NZBN code .
is there any way please ?
EDIT:
i am passing the NZBN number as tax_id to Stripe so Stripe check it with what ever api and tell me that the tax_id is not a valid nzbn , but when i put a valid nzbn it takes it correclty how to prevent entering a not valid NZBN before going to stripe

Answer 1

This is a really old question but it has no answer, so I thought I'd share;
NZBN (different from the NZ GST number) is a plain old GTIN 13. This is my TypeScript for checking for 1) a valid GTIN, and then 2) a GTIN13 specifically
/**
* Boolean function to test code against GTIN published checksum method(s)
*/
export function isGTIN(text: number | string): boolean {
try {
const r = /[\D]/g,
gtin = typeof text === "number" ? text.toString().replace(r, "") : text.replace(r, ""),
paddedValue = gtin.padStart(14, "0")
if (!gtin.match(/^(\d{8}|\d{12,14})$/)) return false
let result = 0
for (let i = 0; i < paddedValue.length - 1; i += 1) {
result += parseInt(paddedValue.charAt(i), 10) * (i % 2 === 0 ? 3 : 1)
}
return (10 - (result % 10)) % 10 === parseInt(paddedValue.charAt(13), 10)
} catch (err) {
console.error(err.message)
return false
}
}
/**
* Boolean function to test NZBN (GTIN13) against published checksum method
*/
export function isNZBN(text: number | string): boolean {
try {
const r = /[\D]/g,
gtin = typeof text === "number" ? text.toString().replace(r, "") : text.replace(r, "")
// NZBN is a GTIN 13
if (gtin.length !== 13) return false
else return isGTIN(gtin)
} catch (err) {
console.error(err.message)
return false
}
}

Answer 2

While you could rely on validation error instead of implementing this yourself, you can also optionally pre-validate the input. This is really up to you.
Validation follows the OECD TIN specifications, such as for NZ IRDs, which looks to be 8 or 9 numeric digits. If the NZBN has a different spec than this, you'd need to implement a validation check before submitting.