Hello,
The plugin is using the Authorize.Net SDK and JavaScript Library.
Please note that the Authorize JS needs HTTPS on the website in order to work properly, so the plugin is doing pre-check and won't propose the payment method if SSL is not detected.
The plugin display the credit card inputs which won't be processed by HikaShop but directly by the Authorize JS library.
That lib will generate a "card token" which will be stored in the checkout data and will be "consume" at the order creation.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.