I'm not a coder and need some help. I'm trying to add subscriptions to certain users via REST API using a PHP script. My issue is that I don't know the user's "user_id" - but I do know the login name. http://www.example.com/amember/api/users?_key=xxxx&_filter[login]=test I can see the user_id here, but how do I pass this on as a variable in my PHP script?