Example, using Node, on how to get user subscriptions using the Google Play Developer API (with androidpublisher role)

android-google-play-api-subscriptions.js

const { google } = require("googleapis");

const publisher = google.androidpublisher("v2");
const OAuth2 = google.auth.OAuth2();

const SERVICE_ACCOUNT_EMAIL = "some_google_acccount@gmail.com";
const SERVICE_ACCOUNT_KEY_FILE = require("./path/to/credentials.json");

const jwtClient = new google.auth.JWT(
  SERVICE_ACCOUNT_KEY_FILE.client_email,
  null,
  SERVICE_ACCOUNT_KEY_FILE.private_key,
  ["https://www.googleapis.com/auth/androidpublisher"],
  null
);
jwtClient.authorize(function(err, tokens) {
  if (err) {
    console.log("There was an error :(", err);
    return;
  }

  publisher.purchases.subscriptions.get(
    {
      auth: jwtClient,
      packageName: "com.your.android.package",
      subscriptionId: "The purchased subscription ID (for example: monthly001)",
      token:
        "The token provided to the users device when the subscription was purchased"
    },
    function(error, response) {
      if (error) {
        throw error;
      }

      console.log("Hey, we got a response!");
      console.log(response.data);
    }
  );
});