TBH, I've fallen back to using the aws command-line tool. I use my module IPC::Run3::Shell:

use warnings;
use strict;
use IPC::Run3::Shell [ aws => {fail_on_stderr=>1}, "/path/to/aws" ];
use Cpanel::JSON::XS qw/decode_json/;
use Data::Dumper;

my $PROFILE = 'MyProfile'; # aws configure --profile=MyProfile
my $buckets = decode_json( aws(qw/ s3api --output json --profile /,
    $PROFILE, 'list-buckets') );
print Dumper($buckets);
[download]

Update: See also.