I cobbled together an example for using your %config as a hash as you used it rather than as a hashref. 
#!/usr/bin/env perl
use 5.011; # implies strict + feature 'say'
use warnings;

use Data::Dumper;
use Config::Tiny;

use constant {
    INIFILE  => 'example.ini',
    ENCODING => 'encoding(Windows-1252)'
};

sub create {
    my %config = (
        my_sftp =>  {
            domain   =>  'example.com',
            username =>  'myname',
            password =>  'topsecret',
        },
        my_github =>  {
            email    =>  "me\@example.com",
            password =>  "confidential",
        },
    );

    say Dumper \%config;

    my $ini = bless \%config, 'Config::Tiny';
    $ini->write(INIFILE, ENCODING);
    say 'created ', INIFILE;
}

sub show {
    say 'reading ', INIFILE;
    my $ini = Config::Tiny->read(INIFILE, ENCODING);
    my %config = %$ini;
    say Dumper \%config;
}

create() unless -e INIFILE;
show()

[download]

There are two configuration values which don't belong into the config file :-) which I defined using constant.

If you don't want to mess with Config::Tiny's internals, you could replace the my $ini = bless \%config, 'Config::Tiny'; line with 
    my $ini = Config::Tiny->new;
    $ini->{$_} = $config{$_} for keys %config;

[download]
Edit: Sorry, this was meant as a reply to Re^2: redacting from config hash...

Update: changed 'example.ini' to INIFILE in line 40 🤦

In reply to Re^4: redacting from config hash by soonix
in thread redacting from config hash by Aldebaran

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