To charge end users via SMS you use the Json/Rest API and add the parameters for tariff, currency and vat. The charges service also have to be setup with operators before you can start charging. COntact the support at content-support@sergel.com for more information.
When making charges you need to assing the charge the correct categories.
You also have to follow the rules that are in place for the Swedish market, find them here at MORGAN FORUMS homepage.