POSTMAN
https://www.getpostman.com/docs/chaining_requests
http://blog.getpostman.com/2014/01/27/extracting-data-from-responses-and-chaining-requests/
var jsonData = JSON.parse(responseBody);
postman.setEnvironmentVariable("token", jsonData.token);
Add
{{token}}
PAW
Variables from previous responses
https://paw.cloud/docs/environments/environments-from-responses
In the response view, right-click on the field you're interested in and pick Copy as Response Body Dynamic Value