Memberstack members but Ghost emails and posts? Can we API make users in ghost?

I’d like to start with Ghost, but ultimately build a community that uses Memberstack.

Can we use an api to extract, autocreate and delete members in Ghost? So in the future I can have users migrate to Memberstack but continue to use Ghost as a platform for the blog/newsletter? It would be great if we can manage memberships with memberstack but use Ghost for the email of the newsletter.