How to find out what database to look for the login authentication

Problem :

I'm working on a project that has a website panel and an android app and for database i'm using mysql to save users information like username and password.

What i'm going to do is for every client(company), i want to create a database with it's unique name but with same tables and my problem is when users are logging in, i don't know how to find out which database should i use for login authentication because i think it's a bad idea to look in the all of databases to find user's information.

Thanks for your help in advance.

Solution :

First step: Create API for connect Android User to Mysql user+database, so when you authenticate, the API send you back the connection string, different for every user. It means that you need a database, only for auth and connect.

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