3-D Secure support

The existing interfaces support 3-D Secure.

Integration	3-D Secure	Alias	Merchant action
Payment Page			Apply 3-D Secure
Split Mode			Apply 3-D Secure
Mobile SDK			Apply 3-D Secure
Secure Fields			Apply 3-D Secure
Server to Server only - Alias for CIT			See one click check out below
Server to Server only - Alias for MIT			Ok, if 3-D Secure is applied at time of creation of Alias.

One Click Checkout

Merchants offering one click checkout often apply the following pattern:

Initial registration with or without 3-D Secure by creation of an Alias in order to register the payment method.
On payment, Alias gets applied by a Server to Server interface.

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Not PSD2 and SCA compliant
Cardholder initiated transactions (CIT) require SCA.

3-D Secure has to be applied for creation of an Alias and registration of a payment method.
3-D Secure has to be applied at each cardholder initiated transaction. Server to server only does not support 3-D Secure.

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Merchant action
Switch to an integration supporting 3-D Secure and Alias. Apply 3-D Secure at creation and charge of an Alias.