CPAN::Groonga

 JSON qw//;
use Class::Accessor::Lite (
    ro  => [qw/
        api_base
        access_key
        secret_key
    /],
    rw  => [qw/
        client
        sign
        timestamp
        decode_json

     croak "require 'access_key' and 'secret_key'.";
    }

    my $self = bless {
        decode_json => 0,
        api_base    => 'https://api.bitflyer.jp',
        %args,
    }, $class;

    $self-

__ . "/$VERSION",
            default_headers => {
                'Content-Type' => 'application/json',
                'ACCESS-KEY'   => $self->access_key,
            },
            timeout => 15,