Hi Niklas
For your first question, Membership Pro will work with any template, so it will work with JA Good from Joomlart which you are using.
For payment, the extension works with PayPal out of the box. However, for your Swedish app payment, you will need to find someone to develop a payment plugin to work with that APP, we have developer documentation available at
membershipprodoc.joomservices.com/develo...n/dev-payment-plugin
Regards,
Tuan