This project serves as a simple backend designed to work with Klarna on Demand for Digital Goods.

The server itself is implemented in Ruby using Sinatra. Even if you are not familiar with the language do not worry, as the code has been extensively documented. The file that contains the entirety of the server is backend.rb.

This sample backend interacts directly with Klarna's on Demand API, specifically for the purpose of authorizing and capturing orders. You can read more about the API here.

If you wish to run the server, the first step is installing Ruby.

Once that's out of the way, open a terminal and run the following command:

gem install bundler

which will install Bundler, a dependency manager that will allow installing the project's dependencies. Still in the terminal, navigate to the project's directory and run:

bundle install

to install said dependencies.

The server is now ready to run. Simply point a terminal to the project's folder and run:

rackup

You can reach the server on http://localhost:9292.

The sample backend is available under the Apache 2.0 license. See the LICENSE file for more info.