Kazuki Qualified Invoice Number for WooCommerce

Who this is for: WooCommerce shops in Japan that sell to registered businesses and must record the buyer’s 適格請求書発行事業者登録番号 on orders and invoices.

What it does in plain terms:

When a company buys from your site, they often need their registration number on the transaction record. This plugin adds a field at checkout so customers can enter it. The number is saved on the order, shown in the admin order screen, and can appear in order emails.

Typical workflow:

1. Install and enable the plugin.
2. WooCommerce → Settings → インボイス登録番号 — choose optional or required.
3. Customer enters their number at checkout (classic or Checkout Block).
4. You see the number on the order when preparing invoices or bookkeeping.

Features:

• Checks that the value looks valid (T + 13 digits) before the order is placed
• Works with WooCommerce Checkout Block
• Optional: show the number in customer order emails

This plugin does not check whether the number is really registered with the tax office. For automatic verification at checkout, use Kazuki Invoice Registration Verify for WooCommerce. You can also check numbers manually on the NTA public site.

Works well with:

• Kazuki Invoice Registration Verify for WooCommerce — checks the number against the NTA public register at checkout
• Kazuki Accounting Export for WooCommerce — copies the registration number into Yayoi journal export

Enjoying this plugin? If it helps your shop, a review on WordPress.org would mean a lot to us — thank you.