New Post: Checkout stage3 add a new button next to cancel button

I'm afraid the trouble with Authorize.net remains that none of us here actually use it or know how it works. Hopefully someone who has set it up in the past knows how to make it work properly.

You can add any HTML to the checkout, but I would assume that you need it to do something dynamic such as post payment data to the gateway, and it's not going to do that. But then again, the provider should also have that sort of functionality in it. Is that still not working for you?
Rob