we have a problem with Cisco Meraki REST API (https://developer.cisco.com/meraki/api/#/rest/) It seems that there doesn't exist REST endpoints for getting such basic information like ARP, MAC tables.
Is there anyone who knows how to get this data per device?
I think that is the older site for the API. The one I use is at https://dashboard.meraki.com/api_docs and it contains a lot more options. I don't know if ARP and Mac Address Tables are available anywhere, but there is a developer early access program that you can join to get a look at the upcoming version 1 :https://developer.cisco.com/meraki/meraki-developer-early-access-program/.