Some help for develop modulo pay for Spanish Bank

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I developed one module for spanish TPV Ciberpac (SimaCaixa module)

Now, I develop a new module for another bank.

The problem it's a parameters for tep_draw_hidden_field.

I need pass a string with 15 characters, 9 with characters and 6 space for rigth " "
[code]Example: $fuc = "123456789" // (I ineed thi "123456789      "
$fuc = str_pad($fuc, 15, " ");
[/code]

Other problem it's that I need run a external program.

[code]$parametros = $idpedido ." ". $importe . " " . $fecha . " ". $moneda;
$comando = "./Firma ".$parametros;
$firma = passthru($comando,$resultado);
[/code]

Well, I put this on 
[code]$process_button_string = tep_draw_hidden_field('fuc', $fuc) .
 ..
 ..
 tep_draw_hidden_field('firma', $firma) .
...
[/code]

But the paramtres fuc it's return without "    " to rigth and parameter firma it's null.

Thanks for your help.