If you sell software licenses, digital subscriptions, gift cards, or any product that needs a unique code delivered to the customer, you have probably been through this workflow: customer places an order, you open the order in WooCommerce, you look up an unused code from a spreadsheet, you paste it into the order notes or a custom email, and you mark the code as used in your spreadsheet.
This works when you sell five products a week. It breaks when you sell fifty. It is impossible at five hundred. And every manual step is a chance for error — sending the wrong code, reusing a code, or forgetting to send one at all.
Automated serial assignment eliminates all of these problems. When a customer completes a purchase, the system assigns a unique code automatically and includes it in the order confirmation email. No manual work, no spreadsheet, no mistakes.
The Serial Codes Generator and Validator plugin integrates directly with WooCommerce to handle the full lifecycle:
The entire process happens in the background without any admin intervention.
In the plugin admin, create a new code list. Give it a descriptive name like “Pro License Keys 2026” or “Gift Card Codes — March Batch”.
You have two options for populating it:
Open the product you want to assign serial codes to. In the product data panel, you will find a section added by the plugin where you can:
In the plugin settings, decide where serial codes should appear:
You can also hide the CVV from emails or PDFs separately if you want to provide the security code through a different channel.
The plugin supports a “reuse” mode: when enabled, it first looks for an unused code in the assigned list before generating a new one. This is essential for scenarios where codes have already been printed on physical cards (like gift cards or scratch-off vouchers) — you need the digital code to match the physical one.
When reuse mode is off, the plugin always generates a fresh code, which is better for pure digital delivery where the code only needs to be unique, not pre-determined.
When a WooCommerce order is refunded or cancelled, the plugin can automatically free up the assigned code — removing the order association so the code can be reused for future orders. This prevents code waste and keeps your available inventory accurate.
You can enable or disable this behavior in the settings depending on whether code reuse after refund is appropriate for your business.
For variable products — say a software license with Basic, Pro, and Enterprise tiers — each variation can pull from a different code list. The Basic variation might use 30-day trial codes while the Enterprise variation uses permanent license keys, each from their own pre-configured list.
The plugin handles this natively through WooCommerce variation support. Configure each variation independently in the product editor.
Generate license keys on purchase and deliver them in the confirmation email. Customers activate the key in your software. The plugin tracks which keys are assigned and to which order.
Pre-load a batch of gift card codes that match physical cards. When a customer buys a digital gift card, they receive the code immediately. When they buy a physical card, the code on the card is already in your system for later redemption.
Sell access to premium content, courses, or downloads by delivering a unique access code on purchase. Combine this with the validation shortcode so customers can enter their code on a gated page to unlock content.
For handmade, limited edition, or luxury products, auto-assign a unique certificate number to each sale. Customers can verify the certificate on your website at any time.
For WooCommerce Subscriptions, the premium version can reuse the same serial code across renewal orders — so a customer keeps their original license key when their subscription renews rather than receiving a new one each billing cycle.
The admin panel shows you how many codes are available in each list, how many have been assigned, and how many are unused. This gives you a clear view of your “inventory” — when a list runs low, you can generate more codes before running out.
For products with pre-loaded codes (like printed gift cards), monitoring this is especially important. Running out of codes means orders cannot be fulfilled until you generate and load more.
Automating serial code assignment removes a tedious, error-prone step from your order fulfillment process. Whether you sell five licenses a week or five hundred, the system handles it identically — no manual work, no mistakes, no delays.
Install the free Serial Codes Generator and Validator plugin to test the WooCommerce integration on your site. The free version supports full auto-assignment with up to 500 codes.