There is a bug with the local checkout server behaviors, so for them to be working, Ray will need to update them and we will need to release an updated version of the extension, i have logged the issue, but we have had our nose to the grindstone on fixing compatibility updates with DW CC 2014.1, and now we need to start addressing compatibility with Mac OS Yosemite.
Using eCart 6.1.0, the checkout wizard will generate MySQLi code for the store order summary and store order details behaviors if you have a MySQLi connection created and select that in the checkout wizard.
where want to use your own form, i would use the checkout wizard to create the pages, then replace the check for on the shout pages with your own, make sure to use the same form name and ID, and also make sure to use the same names and IDs for the form elements.
As for your questions about authorize. net, I Would need to troubleshoot in oder to see what is wrong.
In some cases, you can run the checkout from your local XAMPP, but in other cases, you should use the remote server and SSL.
If you are using the SIM implementation method, (filling in Credit card info on your site) it needs to use SSL.
If you would like us to work with you one on one through a premiere support incident for troubleshooting, we can do that, please submit a request here:
http://www.webassist.com/premier_request.php
other wise i will need a link to the site and your FTP information in the private message section to troubleshoot.