@Kevin Tao while there are no examples for this case, it is easy to find out.
Generally, we follow the rest rules, meaning that GET will get records, POST will create records, PUT will update and DELETE will delete.
However, the error I get is 422 Unprocessable Entity: "Please provide the subscriber email address." Is my Body formatted correctly? Does it expect JSON or XML param format?
I am using Advanced REST Client (a Chrome extension) to send my requests, and I disabled the API Signature check .