my $mailchimp = Mail::Chimp3->new(
    api_key => 'mykey'
);
my %merge_fields = (
	'FNAME' => 'My',
	'LNAME' => 'Name',
	'PHONE' => '760-720-0000'
);
my $response = $mailchimp->add_member (
	list_id  => '49ef108521',
	email_address => 'test@jmydomain.com',
	status => 'subscribed',
	merge_fields => %merge_fields
);