Instructions

In order to fill a pdf, send two files to /filler, one with fieldname fdffile and one with fieldname pdf-to-fill. The fdffile is a fdf or xfdf file and it will fill the pdf form and the resulting PDF streamed back to the client.

CURL Example

curl -F "fdffile=@file.xfdf" -F "pdf-to-fill=@my.pdf" http://localhost:9021/filler > filledpdf.pdf

PHP Example

<?php
  $ch = curl_init("http://localhost:@PORT/filler");
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, [
      'fdffile' =>  new \CurlFile(__DIR__.'/fdffile.xfdf','text/plain','file.xfdf'),
      'pdf-to-fill' =>  new \CurlFile(__DIR__.'/pdf-to-fill.pdf','application/pdf','my.pdf')
  ]);
  $result = curl_exec($ch);
  file_put_contents("filledpdf.pdf", $result);

Background Info

This system is using pdftk as the engine to support this function.