Is there any way to get the email of the current logged in user and send that information to another application?

Question

I have embedded an iframe in the source code of each person added to my People plugin

I am looking for a way to conditionally render a button based on who the logged-in user is. If the email of the logged-in user matches the email in the iframe's param then the button ('Click here to update Profile') should appear. Otherwise, it is not on the page when the logged-in user views other people.

Buildfire People Plugin

I looked through the public api docs and tried using the /auth/verify_credentials but this is for logging in, this will not return the email of the logged-in user.

I know buildfire SDK has a buildfire.auth.getCurrentUser(callback) function that can be used. I need the callback to send that info to another application.

The app that I created is deployed on netlify and the backend is deployed on heroku.