Hi,
The techjoomla payment plugins only handle the total amount, not the details of the order.
So the billing address is not passed to 2 checkout.
To add that, the plugin code should be modified there:
take.ms/5Jeeu
In order to add the variables for the billing address data.
For the redirection, the fact that you need to click on the button is because there is no automatic submit process in the plugin code. There
take.ms/aUTIl
a bit of javascript code should be added to handle the automatic submission of the form once the page is loaded.
Note that there is another 2checkout plugin developed by MintJoomla here:
www.mintjoomla.com/downloads/item/11-oth...-payment-plugin.html
It's not free, but I guess that these issues aren't in this 2checkout payment plugin and you would get support there to help you customize that plugin.