Hello,
Since it was your very first post in our forum, unfortunately we lost the information you filled regarding your HikaShop version.
Would it be possible to know which version you're using ?
Did you try with a simple payment method such as "collect on delivery" ? Can you give us more details about your configuration (as Mohamed asked) ?
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.