Hi,
The plugin "credit card" store the data in the order history.
It could be possible to modify that plugin to let it save the data in the "order payment_params" instead of the order history table.
But you have to know that we are not very found of saving credit card number in a database ; that plugin has been made to answer to some specific needs but it should not be used in every countries.
For example in France that plugin is forbidden by some laws.
So we want to be sure that you are sure you want to use that plugin.
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.