Hi,
The plugin ordering just affect the order that the plugin will be called for the triggers.
In your screenshot, you are in the Joomla plugin manager, the "ordering" option is a Joomla ordering option and we don't add it.
What I can say is that before HikaShop 2.2.x it affects the ordering in the checkout. With HikaShop 2.2.0 and the new payment method system, this joomla ordering does not have any impact.
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.