How to emulate requests to Heroku via cURL PHP?

Question

PHP

There is an android application that sends requests to the Heroku server:

Parse.initialize(
    new Builder(this)
        .applicationId("aaa")
        .clientKey("bbb")
        .server("https://xxx.herokuapp.com/parse")
    .build()
);

How to pass the same parameters (applicationId and clientKey) in a GET/POST request implemented in cURL PHP?
For example, something like this:
https://xxx.herokuapp.com/parse?application_id=aaa...
I'm not familiar with the architecture of the Heroku service myself, I'm trying to figure out which HTTPS request goes to the server through Parse.