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my @form_data_pairs = (
  'Encounter1847760942'           => $enc_id,
...
push @form_data_pairs, ('checkbox2' => 1) if $some_other_flag;

my $response = $browser->post($url, \@form_data_pairs, @ns_headers);

my %form_data = (
  'Encounter1847760942'           => $enc_id,
...
$form_data{'checkbox2'} = 1 if $some_other_flag;

my $response = $browser->post($url, [ %form_data ], @ns_headers);