Very useful - thanks!
I just wanted to say thank you to both Jon and Ray for this very insightful thread. I purchased eCart yesterday to accomplish the same objective: Authorize.NET donation form using eCart.
I'm glad I found this posting before I got too deep into the coding. I ran into all the same problems/questions as Jon! .. forgot to assign a name/description for the "add to cart" buttons, didn't know how to set x_test_request to FALSE.
You guys saved me hours of frustration! Thanks Jon for taking the time to come back and post your progress/findings.
Here's what I came up with: ?page_id=22