The Adyen native 3DS2 integration requires one of the latest versions of our APIs for it to work.
If you are using our Classic API (with or without client-side encryption) you will need to upgrade to at least version 40 (e.g. https://pal-test.adyen.com/pal/servlet/Payment/v40/authorise).
If you are using our Checkout API (with or without Secured Fields) you will need to upgrade to at least version 41 (e.g. https://checkout-test.adyen.com/v41/payments).
Our newer API endpoints are backward compatible with older versions of the endpoint, so you can expect all current functionalities you are using to continue to be supported.