I didn't set-up Authorize - the client did and I believe after speaking with them that he set it up incorrectly. So its 'out of my hands' - aargh!
But I would like to add the option of using Paypal - because it may take a little while to rectify the problem (He didn't sign up for a merchant account, thinking his Intuit account would work...)
I found this post from you:
"You could always create two sets of checkout pages, one for authorize.net the other for paypal. then on the cart page, and a Checkout With Authorize.net button and a checkout with papal button."
Could you elaborate just a little? What settings would I use in the globals file? Do I need to change something in ecart so that it will send the info to both places??