Hi,
It would require a specific (and custom) development in order to create a new shipping plugin for the GLS API.
We have a developer documentation page which explain the basics for a plugin development.
www.hikashop.com/support/documentation/6...mentation.html#howto
You can also take a look at the HikaShop shipping plugin within the HikaShop packages.
There are also some shipping plugins (make by third party) available in the Github repository :
github.com/hikashop/
I hope it will help you for your plugin implementation.
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.