As a developer on 1upHealth, you can connect your application to data from multiple health systems. All you need to do is direct your users via the 1upHealth connect API and have them OAuth via their patient portal credentials.
For testing purposes EHR vendors have made these test username and passwords available. In our application, the demo connection health systems will be accompanied by the text
This account is currently not working, we've raised the issue to Allscripts
If you have not already created a developer account here's the link to sign up free.