My client is using a payment gateway that is an Authorize.net emulator. When I test -- I get the "Security hash problem" error at the top. I'm using the A.Net AIM module and have left the hash field blank. I don't see anything about generating a hash code on the gateway's admin site.

Will this work when I switch to Live mode?

Do I need to include something different for the hash field?

Do I remove the hash field code? If so, how?

Thank you for any help you can provide!