How do you get inventory changes using the LightSpeed Retail API? Another thread mentioned that WebHooks are LightSpeed eComm only.
It is indeed too bad that Retail doesn't have webhooks. A lot of cloud-based POS systems employ them.
Check out this link and you can see where you can query the Item endpoint based on timestamp --> https://community.lightspeedhq.com/en/discussion/101/finding-changes-in-inventory.