Updated October 29, 2019
Yes. By installing or upgrading to MemberMouse v2.3.0+, your checkout process will comply with the Strong Customer Authentication (SCA) requirement. Read this post for more information about the most recent release and how to upgrade.
In brief, the main requirement of PSD2 as relates to online businesses is Strong Customer Authentication (SCA) - similar to what people refer to as two-factor authentication - which necessitates a 3D Secure (3DS) checkout flow for initial and one-time purchases where both the initiating and acquiring banks are both in the European Economic Area (EEA).