Noriko,
Are you trying to locate a client on the map or link to the dashboard page for the client details? These are two different use cases.
If you just want the location of a client MAC address, we have an example:
http://live-map.meraki.com/
To build this, follow our detailed guide here:
https://github.com/meraki/scanning-api-app
If you want to link to the Dashboard's Client details page, you'll need to know the URL including the network's hash and the client's hash which is only available in the UI. We don't have an API that constructs the URL.
If you want to check if a client is blocked, you can use this API call:
https://dashboard.meraki.com/api_docs#return-the-policy-assigned-to-a-client-on-the-network