Here you can download the example code used in the API-documentation (http://developer.fortnox.se/examples/code-examples/php/). Feel free to add new examples for other HTTP libraries or fix any bugs you find by pull request.
Example code for PHP:cURL from the PHP standard library.
Creating a new resource
$raw_response = apiCall( 'POST', 'articles', '{"Article":{"Description":"My description"}}' );
$response = json_decode( $raw_response, true );
$article_number = $response[ 'Article' ][ 'ArticleNumber' ];
Updating a resource
apiCall( 'PUT', 'articles/' . $article_number, '{"Article":{"Description":"My updated description"}}' );
Retriving an existing resource
apiCall( 'GET', 'articles/' . $article_number );
Deleting a resource
apiCall( 'DELETE', 'articles/' . $article_number );
Retriving a nonexistant resource
apiCall( 'GET', 'articles/' . $article_number );
The MIT License (MIT)
Copyright (c) 2013 Fortnox AB, Jesper Svensson
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 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.