问题 I know that I can use Firebase's phone verification on Android and iOS , but the problem is that the information about client's verification can easily be forged on the client side, because I using only server side SSL certificate, so, only client knows that the server is trusted. So, I decided to send mobile number on the server-side and check it there: send verification code and ask this verification code from the user. But I can't see any C++ server Firebase SDK , only client-side C++ SDK