How to whitelist circleci servers on my api

My e2e tests are currently failing because (I believe) my staging backend does not allow requests from the circle job to get through. Our staging BE is hosted on Heroku and we manage the whitelist on an environment variable, so adding an entry should sort it. however, am not sure what to add there, what domain name?

It’s not possible to whitelist IP addresses for various reasons. You can read more about it and see available alternatives in this support article.

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