How the integration change
With the introduction of the 3ds 2.0 protocol, for every transaction the 3ds server will have to send an authentication request to the issuer, which is responsible for checking the level of risk of fraud.
To work, the 3ds server will need additional information regarding the buyer and the payment, which will have to be passed by Gestpay. This means that the merchant has to add some parameters to the payment creation call.
If you need in app integration, you can find documentation about SDK here.
In the coming days the complete documentation will be released, with details about which fields have to be inserted and how to change the integration.