Sign up users to multiple Ghost Pro sites with one registration only? Can Zapier do it?

Using Ghost
1

Hi there, I have three different sites under one brand. I’ve separated them out to keep specific topics independent, but one of my subscription options is having people subscribe to all of them in a bundle offer.

However, for the experience to be smooth I would like them to be registered to all three sites in one go, instead of having to do it manually.

I’m on Ghost Pro, not self-hosted.

Would it be possible to trigger such a cascading registration using e.g. Zapier or something similar? So that people who select the bundle plan on any single site get subscribed to all three at once?

Does anybody have any ideas how to approach this? Thanks in advance.

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I’m not sure Zapier can do it, but you certainly could do something custom if not. The web hooks and api are there. The trick is going to be not creating a loop, since it sounds like you’re proposing multiple sources of truth…,