Hi,
Only HikaShop plugins are loaded for that specific context.
Shipping plugins are made to provide a shipping method ; so they are loaded when we need them : during the checkout and while dealing with cart or orders.
So you will need to have a plugin in the "hikashop" group to be loaded and use these triggers.
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.