E-Invoice Rules Checker (EN 16931)

E-Invoice Rules Checker (EN 16931) is a trading journal product available on the Whop marketplace, created by ReadyStack and launched in September 2026.

E-Invoice Mandate Lint: Lints UBL and CII invoice XML against EN 16931 and the national e-invoicing mandates that are live in 2026 E-invoice XML checked against EN 16931 and the 2026 national mandates. Who it's for Developers and integrators who build the billing code that emits EU e-invoices. What breaks, and when France requires every company to be able to receive e-invoices from 1 September 2026 and Poland's KSeF became mandatory in 2026; an invoice XML missing a mandatory mention is rejected by the platform. What you get • 5 ReadyStack linters on this shelf (VS Code Marketplace and Open VSX), plus any added later • Your key unlocks the whole-workspace sweep and the dated report in each • Rule updates pulled from ReadyStack without a reinstall • The single-file check stays free without a key FAQ Q: How is this different from asking ChatGPT? A: Each check reads your own file against a rule file that names the provision and its start date; the report records the run date, check version and file fingerprints. A chat answer has none of that and may describe last year's rule. Billed $79 a year. All linters on the shelf: https://getreadystack.com/collections/e-invoicing

E-Invoice Rules Checker (EN 16931) has is priced at $79/year.

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