I just finished the testing required by them and soon to make it live..
This only works with people who are using Moneris as there payment processor but i'm sure it could be modified easily for anyone else.
Is there any interest in the module? if there is i'll clean it up and release it... but be forewarned it's not an easy task to become authorized to accept debit cards
(38 tests to be completed, results faxed, specific things pages require, rules about logo and how you word Interac, trademarks reflected)