Can someone give me advice on cleaning this code. It's more messy then I expected. I got like 10-15 more ifs to be added.

I've thought of adding the error messsages in methods and then just check if method returns true, or false it'd throw error..

    if( isset($_SESSION["access_token"], $_SESSION["user_email"], $_SESSION["username"]) ){
    if($GoogleAccess->does_account_exist){
        if(!$GoogleAccess->is_g_acc_banned()){
            if(!$GoogleAccess->is_ip_banned()){
                if(!$GoogleAccess->is_ip_blacklisted($blacklist_ips)){
                    if($GoogleAccess->is_user_acc_verified()){
                        header("location: ../member.php");
                    }else{
                        $error = "Please verify your account";
                    }
                }else{
                    $error = "This IP's blacklisted.";
                }
            }else{
                $error = "Your IP's been banned";
            }
            
        }else{
            $error = "This account has been banned";
        }
    }else{
        //mean doesn't have account. Register user and send verification to email
    }