[Lorri Coburn LLC]

I don't have an answer but I am having the same problem. I get an error message saying "MD5 Signature does not match." I have put in the MD5 code from authorize.net onto the ecwid site.

[Eugene Rimmer]

The 'MD5 Signature does not match' error is caused by the incorrect credentials, that you put in your Ecwid control panel → System settings → Payments, Authorize.Net settings. Please, make sure that specifically the MD5 Hash Value matches the one provided for your Authorize.Net account.