Hi,
I though that the Nicolas answer was already clear enough and gave you the answer right before you ask new questions.
There is no SOAP or REST API available. It's something we're working on.
For now, you would have to add your own script or plugin, and call the HikaShop classes/methods to get the data and send it.
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.