TUI.js (Tunisia’s Unique Identifier)
The unique identifier serves as the taxpayer's identifier to the tax authorities in Tunisia, it's composed of 7 digits with a control key, for more details check out trovit.tn
Usage in the browser
<script src="https://cdn.jsdelivr.net/npm/@mczentechnologies/tui"></script>
<script>
new TUI("0789012H").isValid(); // true
</script>