Make blacklist in application backend - if you in list you can't do registration -- 2

Hello,

I need do blacklist in my application. If you are in list you can't do registration or your status not active, or smth like this.

We are using backend - firebase - REACT NATIVE.

Apps is - REACT.js

Budget ~30USD. Please write saparas job 30.

Best solution do just in backend, and no need update application.

Beceriler: Mobile App Development, Node.js, React Native, Google Firebase

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Proje NO: #28285641