Popbill for WooCommerce — electronic tax invoice (전자세금계산서) from an order

Popbill KR for WooCommerce saves a WooCommerce order as a draft electronic tax invoice (전자세금계산서) in your Popbill, where you issue it; in Pro it can be issued at once. The buyer’s business registration number (10 digits) is read from an order field. The Popbill site offers an API and an integration request form; we found no ready connector for WooCommerce (2 November 2026).

This module has never run against the real Popbill. We had no Popbill account (it needs Korean registration data that we do not invent), so nothing was ever sent to the real service.

What the free version does

“Save as draft in Popbill” on the order registers a draft: the supplier from the settings, the buyer by business number, amounts in won (VAT 10%). The status can be refreshed. Without a buyer number, or in another currency, the order is not sent and the reason is shown. A repeat creates no duplicate; a Popbill outage is shown in plain words with a retry button.

What Pro adds

Automatic sending by status, issuing the document at once or with the “Issue the tax invoice” button, and the tax-office approval number on the order.

How it works, step by step

1. In Popbill get a LinkID and a SecretKey (test and production are separate).
2. Enter them, the supplier’s business number and its details in the settings.
3. Set the meta key with the buyer’s business number.
4. On an order press “Save as draft in Popbill”.

Under the hood

• The LinkHub token request is signed with HMAC; the secret is never printed back.
• The Popbill document number is built from the prefix and the order number; a repeat does not duplicate.
• Languages: English, 한국어.

How to install

1. Plugins → Add New → Upload Plugin: choose the zip and activate it.
2. WooCommerce → Popbill KR: LinkID, SecretKey, supplier details.
3. Enter the service credentials and test the connection.
4. Try one test order before you switch the automation on.

The module is not on wordpress.org yet: the free version and Pro are one archive from this page. Without a key it works as the free version.