I believe you are looking for Magento 2 integration.
This link may help you https://retailexpress.com.au/pos-integrations/ecommerce/magento/
This link has some technical instructions on how to integrate skylink with Magento 2 - http://docplayer.net/35831300-Skylink-for-magento-2.html
Other than that I don't see any clue about it. You can try to contact them through their own page and understand more about it.
Please give Kudos if it helped and accept it as a solution.