Complete a 3DS authorisation

For an authenticated 3D Secure session, completes the payment authorisation. This endpoint must receive the `md` and `paResponse` parameters that you get from the card issuer after a shopper pays via 3D Secure. > This endpoint is part of our [classic API integration](https://docs.adyen.com/online-payments/classic-integrations/api-integration-ecommerce/3d-secure). If using a [newer integration](https://docs.adyen.com/online-payments), use the [`/payments/details`](https://docs.adyen.com/api-e...