The request is getting refused as the endpoint version you are pointing to doesn't support 3DS2 yet.
- If you are using the Classic Adyen API, we recommend upgrading to versions v46 or above.
- If you are using the newer Adyen Online Payments API (aka Checkout API), we recommend upgrading to versions v46 or above.
However, before we proceed with further discussing your native 3DS2 integration, are you aware that you will already be able to support 3DS2 if you are able to support redirect-based authentication?
Take a look at our renewed documentation for guidance on this!