[URGENT] Configuring Authorize.net account - need help!!

[mymallusa]

Hi guys, my names Mike and I just started using Prestashop for my website (www.mymallusa.com)

Everything seems to be pretty self explanatory in the back office but I'm having problems with my Authorize.net account (what I use to accept credit card payments).

I've called Authorize.net and they told me I've entered the correct login ID and transaction key but its still not linking up. Heres what I see in my back office:

Authorize.net login ID

Authorize.net transaction key

Sandbox mode
Yes No
Use proxy
Yes No
Proxy url or IP

Currency
Use PrestaShop currency
Use customer currency

Information: In order to use your Authorize.net payment module, you have to configure your Authorize.net account (sandbox account as well as live account). Log in to Authorize.net and follow these instructions.

INSTRUCTIONS TO COME!

I'm guessing it might have something to do with the Sandbox mode, neither I nor Authorize.net know exactly what that is so if someone could help me it'd be GREATLY appreciated!!

[tomerg3]

What module are you using for this?