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my $auth = Authentication::Manager->new( { store => $store } );
if ( $auth->authenticate($username, $password) ) {
    delete_the_data_store($store);
...
else {
    throw_some_exception "invalid credentials";
}

my $auth = Authentication::Manager->new( { store => $store } );
$auth->authenticate($username, $password);
delete_the_data_store($store);