LoginWithEmailNormal.cs

public class LoginWithEmailNormal
{
    public void LoginWithEmail()
    {
        var loginReq = new LoginWithEmailAddressRequest
        {
            Email = EmailField.text,
            Password = PasswordField.text
        };

        PlayFabClientAPI.LoginWithEmailAddress(loginReq, OnSuccess, OnError);
    }

    void OnSuccess(LoginResult result)
    {
        String s = String.Format("Entity token: {0}", result.EntityToken.EntityToken);
        Debug.Log(s);
    }

    void OnError(PlayFabError error)
    {
        String s = String.Format("Error message: {0}", error.ErrorMessage);
        Debug.Log(s);
    }
}