This is a missed opportunity that I believe will be regretted. Otherwise you leave open the field for disputes over who is liable. Auth reversals are issued. Some merchants do not get them in time - they are not fully online, or whatever. Transactions are refused.
Merchants move to another bank.
Many of these merchants have multiple banking relationships. At present they can redirect their transactions more or less at will, but SET seems a bit vague on this point. Well, that's most of what we found with SET on a rapid reading. I must say that it is a very hard read, and very obscure in places. The actual frauds on existing ATM and eft systems have overwhelmingly involved blunders, whether in design, coding or operation, that relatively unskilled outsiders found by chance and exploited in completely opportunistic ways.