I'm trying to set up my site so customers can purchase with the Authorize.net AIM checkout feature. I'm new to this and have never set up payment gateways before. The Auth.net manuals and guides are overwhelming and I'm very confused about what to do.
I have a merchant and developer account and have put in the API keys for both at different times and I get this message "There was a problem finalizing your purchase. (TESTMODE) The merchant login ID or password is invalid or the account is inactive. Please go back and try again."
My site is using SSL. http://www.nuwaybeauty.com
Test mode is on.
Sandbox is on.
I will provide the WP login + Auth.net login to a staff member if needed. I just want this set up and I have no clue how to do this...