We're developing a web app that visualises the progress of the petition in real-time, and we'd like a way to be able to allow a user to "log in" with their Change.org credentials, or somehow verify whether a visitor has signed the petition.
We need this to add a feature wherein the visitor can find their signature in the webapp
Ideally, an OAuth2 flow or something similar would be available, but even something that allows a user's browser to retrieve a token would be great.