Include Payment Gateway for Sweden - Swish & Klarna#156

Main website: Swish.nu
API Integration: https://www.swish.nu/developer#code-examples

Main Website: Klarna.com
Integration: https://developers.klarna.com/

We do not intend to support BNPL products, we believe this is detrimental to the industry and the consumer.

We are however, happy to entertain new payment gateways. We have completed the build for Swish and it is now live for approved accounts.