Difference between 3DSecure attempted and 3DSecure
3DSecure attempted - Card is not enrolled, 3DSecure was applied
3DSecure - Card is enrolled, 3DSecure was applied
See more here on ECI Flag values and meanings
Issuing banks may or may not enroll their customers' cards for 3DSecure.
Either way, our systems will process an initial once-off transaction through 3DSecure (if no tokenisation or card storage enabled).
Some business models and sectors are required, for risk and compliance reasons to only process : Fully authenticated 3DSecure, so that only cards that are enrolled are processed.