is it possible to log in using both?

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5
-- Error-message(debug-mod must be tuned on) -- : no errors

is it possible to log in using both username and email?

Hi,

We are using the Joomla login and registration systems, so I think that you should search on the Joomla forum.
Honestly, I don't really know, but I think that there is third extensions allowing that.