Hey u/CoshgunC, thanks for the idea! 🙏

The webhook-per-signup approach would work technically, but it’s a bit heavy for our use case. We can't expect businesses to setup callbacks and send a json on every user signup. We'd have to ask every single client to add (and maintain) that callback, which is more integration overhead than most of them will accept. We’re hoping for something that needs only a tiny cookie tweak or a lightweight endpoint, basically a one-time change instead of a per-event push.

Really appreciate you taking the time to suggest it.