curl -X POST -H "X-Parse-Application-Id: myAppId" -H "Content-Type: application/json" -d '{}' https://xxxx.herokuapp.com/parse/functions/upsert

import Parse from 'parse/react-native';
Parse.initialize('myAppId');
Parse.serverURL = 'https://xxxx.herokuapp.com/parse/';

https://xxxx.herokuapp.com
https://xxxx.herokuapp.com/parse
xxxx.herokuapp.com