you evaluation sounds about right - I only have the shared test account to work with just now. I need to code and test our software to work with the MD5 hash value. As far as I can tell from other posts on this subject, and please correct me if I am wrong, the share account hash value (obviously) cannot be changed/set - so is there by chance a 'known' one already configured with it? (Even if it is an empty string)
I am using card present method to integrate and I have a test account for card present, When I do HTTP post to the test card present account, which URL do I use. CP documentation shows this https://cardpresent.authorize.net/gateway/transact.dll
for Live accounts.