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.
  NSDictionary *params = @ {
    @"reference":reference,
    @"name":name,
    @"cost":total,
    @"tax_cost":taxTotal,
    @"currency":@"SEK",
    @"user_token":[self getUserToken],
    @"origin_proof":originProof };