As per the current PASA rules (which are subject to change), transactions originating and completed on mobile phones do not require 3DSecure authentication.
However in order to qualify for this exemption Peach Payments requires merchants to add a parameter to their request on mobile transactions via the following API:
Copy n Pay:
Please add the following parameter to the GenerateToken request:
CRITERION.DeviceType = Mobile
XML API:
<Criterion name=“DeviceType”>Mobile</Criterion>