I've had it too. See my post (8 posts above yours) after Square first announced the new API some weeks ago. It appears to have been announced some time ago, before I started using Square.
Anyway, it seems that in the UK at least, not enough people were ready so introduction of mandatory SCA has been put back for quite a while. I would think it likely that the Square-Zencart module will support the new API by then. I was going to have a look myself but like Dr. Byte, have been too busy.
Bookmarks