I'm posting to the auth.net web service to create a credit card transaction. In both test and live, if i use a 9 or below month, I get the error. It was working a while back but started getting this issue. I am left padding zeros to the month. So, the format I'm sending is YYYY-MM, per the specs. The card I'm using now has a 7/12 date and I've confirmed the value I'm sending is 2012-07. I still get this error.
I've seen this post and am following what it said. Any idea on what I'm missing?
Bill