I am currently using machform 12, when I try and take payments using authorize.net I get an error on the payment form stating that "email is required", I am collecting email on my main form, and sending this to authorize.
I'm not having an issue on my own php scripts which send payments to authorize.net, so I know the server is sending them, and that my API settings are correct. When I use Machform though to send payments this is the error I get.
Any help greatly appreciated.