Added some comments and a license

LICENSE

+MIT License
+
+Copyright (c) 2021 Simon Bowie <ad7588@coventry.ac.uk>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

site/ops_api.php

 <?php
 
+# @name: ops_api.php
+# @version: 0.1
+# @creation_date: 2021-09-24
+# @license: The MIT License <https://opensource.org/licenses/MIT>
+# @author: Simon Bowie <ad7588@coventry.ac.uk>
+# @purpose: Performs functions against the European Patent Office's Open Patent Services (OPS) API
+# @acknowledgements:
+# OPS documented at https://www.epo.org/searching-for-patents/data/web-services/ops.html
+# OPS RESTful API specification at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf
+# OPS API functions list at https://developers.epo.org/ops-v3-2/apis
+
 function get_access_token() {
 
   // OPS API credentials (details at http://documents.epo.org/projects/babylon/eponet.nsf/0/F3ECDCC915C9BCD8C1258060003AA712/$File/ops_v3.2_documentation_-_version_1.3.16_en.pdf)

site/public/index.php

 <?php
 
+# @name: index.php
+# @version: 0.1
+# @creation_date: 2021-09-24
+# @license: The MIT License <https://opensource.org/licenses/MIT>
+# @author: Simon Bowie <ad7588@coventry.ac.uk>
+# @purpose: Home page for the application
+
 include '../random.php';
 include '../ops_api.php';
 
 
 ?>
 
-Document reference no.:
-
-<?php
-
-echo $random_record['doc_ref'];
-
-?>
-
-<br><br>
-
-<?php
-
-  if (get_publication_details($random_record['doc_ref'])):
-
-?>
-
-<br><br>
-
-<?php
-  endif;
-?>
-
 Application ID:
 
 <?php
 echo $random_record['abstract'];
 
 ?>
+
+<br><br>
+
+<?php
+
+  if (get_publication_details($random_record['doc_ref'])):
+
+?>
+
+<br><br>
+
+<?php
+  endif;
+?>