> For the complete documentation index, see [llms.txt](https://developers.doku.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.doku.com/accept-payments/doku-checkout/additional-feature.md).

# Additional Feature

## Additional Feature

Beyond the core checkout flow, DOKU Checkout offers a set of optional add-ons that help you boost conversion, run marketing campaigns, and give returning customers a faster experience. Activate only the features that fit your business.

* [**Tokenization**](https://developers.doku.com/~/revisions/yA0Hyt0yw9QhfehhXZdk/accept-payments/doku-checkout/additional-feature/tokenization)**:** Securely save a customer's payment details for future transactions, enabling faster repeat checkouts and recurring payments without asking customers to re-enter their payment information every time.
* [**Google Pay™**](https://developers.doku.com/~/revisions/yA0Hyt0yw9QhfehhXZdk/accept-payments/doku-checkout/additional-feature/google-pay-tm)**:** Let customers pay instantly using the cards already saved to their Google Account, reducing checkout friction and helping increase conversion rates. DOKU manages the Google Pay integration and compliance on your behalf.
* [**Promo on DOKU Checkout Page**](https://developers.doku.com/~/revisions/yA0Hyt0yw9QhfehhXZdk/accept-payments/doku-checkout/additional-feature/promo-on-doku-checkout-page)**:** Create and run discount promotions (flat or percentage-based) directly on the Checkout Page, letting customers apply a promo code and see the discounted amount before completing payment.
* [**Track Campaign Source on Google Analytics**](https://developers.doku.com/~/revisions/yA0Hyt0yw9QhfehhXZdk/accept-payments/doku-checkout/additional-feature/track-campaign-source-on-google-analytics)**:** Pass UTM parameters through the checkout flow so you can attribute completed payments back to the specific marketing campaign, source, or medium that drove them, even though customers are redirected to DOKU's hosted payment page.