I'm not familiar enough with Postman to really help you with that specifically, but if you only have 150 clients in your network then it's probably easier for you to set the 'perPage' value in your request to the max (1000) and not worry about dealing with multiple pages of clients.
Check the documentation for this API call as it defines the requests parameters (including perPage). Set that parameter in your Postman request and you should be good to go.
https://developer.cisco.com/meraki/api-v1/#!get-network-clients
If I was to guess it's because you're either not setting the 'perPage' value to something greater than 10 (default is 10), or you're not fetching the 'links.next.url' returned in the headers of the first (and subsequent) requests you're making.
I'm not familiar enough with Postman to really help you with that specifically, but if you only have 150 clients in your network then it's probably easier for you to set the 'perPage' value in your request to the max (1000) and not worry about dealing with multiple pages of clients.
Check the documentation for this API call as it defines the requests parameters (including perPage). Set that parameter in your Postman request and you should be good to go.
https://developer.cisco.com/meraki/api-v1/#!get-network-clients
Good stuff!
Just remember that when you start dealing with networks over 1000 clients you're going to have to revisit this and figure out how to fetch the 'next' page to get the remaining clients. The next URL is returned in the headers of your first request, so you have to get that URL, and then make a GET to it. The next URL will be populated as long as there are more clients to be returned. When you've got them all the next URL value will be NULL.
