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  <TR ID="payment_amount_row">
    <TH ALIGN="right"><% mt('Payment amount') |h %></TH>
    <TD>
      <TABLE><TR><TD BGCOLOR="#ffffff">
        <% $money_char %><INPUT NAME     = "amount"
                                ID       = "amount"
                                TYPE     = "text"
                                VALUE    = "<% $amount %>"
                                SIZE     = 8
                                STYLE    = "text-align:right;"
%                               if ( $fee || $surcharge_percentage || $surcharge_flatfee || $processing_fee) {
                                  onChange   = "amount_changed(this)"
                                  onKeyDown  = "amount_changed(this)"
                                  onKeyUp    = "amount_changed(this)"
                                  onKeyPress = "amount_changed(this)"
%                               }
                         >
      </TD><TD BGCOLOR="<% length($fee) ? '#cccccc' : '#ffffff' %>">
%        if ( $fee ) {
           <INPUT TYPE="hidden" NAME="fee_pkgpart" VALUE="<% $fee_pkg->pkgpart %>">
           <INPUT TYPE="hidden" NAME="fee" VALUE="<% $fee_display eq 'add' ? $fee : '' %>">
           <B><FONT SIZE='+1'><% $fee_op %></FONT>
              <% $money_char . $fee %>
           </B>
           <% $fee_pkg->pkg |h %>
           <B><FONT SIZE='+1'>=</FONT></B>
      </TD><TD ID="ajax_total_cell" BGCOLOR="#dddddd" STYLE="border:1px solid blue">
           <FONT SIZE="+1"><% length($amount) ? $money_char. sprintf('%.2f', ($fee_display eq 'add') ? $amount + $fee : $amount - $fee ) : '' %> <% $fee_display eq 'add' ? 'TOTAL' : 'AVAILABLE' %></FONT>
  
%        }
%        if ( $surcharge_percentage || $surcharge_flatfee ) {
           <INPUT TYPE="hidden" NAME="surcharge_percentage" ID="surcharge_percentage" VALUE="<% $surcharge_percentage %>">
           <INPUT TYPE="hidden" NAME="surcharge_flatfee" ID="surcharge_flatfee" VALUE="<% $surcharge_flatfee %>">
      </TD><TD ID="ajax_surcharge_cell" BGCOLOR="#dddddd" STYLE="border:1px solid blue">
           <FONT SIZE="+1">A credit card surcharge of <% $money_char. sprintf('%.2f', $surcharge) %> is included in this payment</FONT>
%        }
      </TD></TR></TABLE>
    </TD>
  </TR>

%        if ( $processing_fee ) {
      <TR>
        <TH ALIGN="right"><% mt('Apply processing fee') |h %></TH>
        <TD>
          <TABLE><TR>
            <TD BGCOLOR="#ffffff">
             <INPUT TYPE="checkbox" NAME="processing_fee" ID="processing_fee" VALUE="<% $processing_fee %>" onclick="<% $opt{prefix} %>process_fee_changed()">
            </TD>
            <TD ID="ajax_processingfee_cell" BGCOLOR="#dddddd" STYLE="border:1px solid blue">
             <FONT SIZE="+1">A processing fee of <% $processing_fee %> is being applied to this transaction.</FONT>
            </TD>
          </TR></TABLE>
        </TD>
      </TR>
%        }

% if ($fee || $surcharge_percentage || $surcharge_flatfee || $processing_fee) {

    <SCRIPT TYPE="text/javascript">

      function amount_changed(what) {

% if ( $fee ) {
        var total = '';
        if ( what.value.length ) {
          total = parseFloat(what.value) <% $fee_op %> <% $fee %>;
          /* total = Math.round(total*100)/100; */
          total = '<% $money_char %>' + total.toFixed(2);
        }

        var total_cell = document.getElementById('ajax_total_cell');
        total_cell.innerHTML = '<FONT SIZE="+1">' + total + ' <% $fee_display eq 'add' ? 'TOTAL' : 'AVAILABLE' %></FONT>';
% }

% if ( $surcharge_percentage || $surcharge_flatfee ) {
        var surcharge_cell = document.getElementById('ajax_surcharge_cell');
        var amount = what.value;
        if (document.getElementById('processing_fee').checked == true) {
          amount = (what.value - <% $processing_fee %>);
        }
        var surcharge = ((what.value - <% $surcharge_flatfee %>) * <% $surcharge_percentage %>) + <% $surcharge_flatfee %>;
        surcharge_cell.innerHTML = '<FONT SIZE="+1">A credit card surcharge of ' + surcharge.toFixed(2) + ' is included in this payment</FONT>';
% }

      }

    </SCRIPT>

% }

<%init>

my %opt = @_;

my $conf = new FS::Conf;
my $money_char = $conf->config('money_char') || '$';

my $fee = '';
my $fee_pkg = '';
my $fee_display = '';
my $fee_op = '';
my $surcharge = '';
my $surcharge_percentage = 0;
my $surcharge_flatfee = 0;
my $processing_fee = 0;

if ( $opt{'process-pkgpart'}
     and ! $opt{'process-skip_first'} || $opt{'num_payments'}
   )
{

  $fee_display = $opt{'process-display'} || 'add';
  $fee_op = $fee_display eq 'add' ? '+' : '-';

  $fee_pkg =
    qsearchs('part_pkg', { pkgpart=>$opt{'process-pkgpart'} } );

  #well ->unit_setup or ->calc_setup both call for a $cust_pkg
  # (though ->unit_setup doesn't use it...)
  $fee = $fee_pkg->option('setup_fee')
    if $fee_pkg; #in case.. better than dying with a perl traceback

}

my $amount = $opt{'amount'};
if ( $amount ) {
  # probably should not happen, but will prevent surcharge being applied to negative due amounts
  unless ($amount > 0) { $amount = 0; }

  $amount += $fee
    if $fee && $fee_display eq 'subtract';

  #&{ $opt{post_fee_callback} }( \$amount ) if $opt{post_fee_callback};

  $surcharge_percentage = $opt{'surcharge_percentage'}/100 if $opt{'surcharge_percentage'} > 0;
  $surcharge_flatfee = $opt{'surcharge_flatfee'} if $opt{'surcharge_flatfee'} > 0;
  $surcharge = $amount * $surcharge_percentage if $surcharge_percentage > 0;
  $surcharge += $surcharge_flatfee if ( $surcharge_flatfee > 0 && $amount > 0 );
  $processing_fee = $opt{'processing_fee'} if $opt{'processing_fee'} > 0;

  $amount += $surcharge;

  $amount = sprintf("%.2f", $amount);
}

</%init>