IACO-535 integrate with sample backend

Sadly, this review request contains a lot of noise, mainly due to some left over files I discarded and a new pod I added to the workspace.

Do give the important bits a glance, and don't forget to check out the [sample backend](https://github.com/klarna/sample-app-backend)'s code as well. The sample backend will also need to have some documentation, which I will get cracking on.