Hi,
I have your contribution installed as well as Authorize.net Consolidated 1.7 and both require making changes to checkout_process.php. After making changes to the file as described by the Authorize.net contribution, and then making changes that your contribution requires, the checkout doesn't work. After clicking "continue" to confirm the order, I'm taken to a blank page. I reverted back to the version of the file just before making your changes but after the Authorize.Net changes and it worked. Do you know why this is?
I would really like to use your contribution, if possible, along with the Authorize.Net one.