Swish is a mobile payment solution backed by a number of Swedish banks. If you want to support this in your application, you need a special agreement with your bank but they offer a Swish simulator that allows for development purposes.

Go to Swish for merchants at [[1]] and download the zipfile containing both an pdf with instructions and a number of certificates.

In principle is the payment (for merchants) started by a PUT operation using a Json PAYMENT object using a certificate, the user pays using a mobile ,the swish server will then issue a callback towards your server withe the result.