This is an accepted solution.
Hi there @DanielKreiner!
Don here from Shopify.
If your Shopify store is based in Austria, you would be able to apply to use any of the following payment gateways for your store.
I'm not familiar enough with all of these options to confirm if they can offer the ability to check out in more than one currency, but they will be able to confirm for you how their integration with Shopify works and what they will be able to support.
You can, of course, offer a currency selector in your store before checkout, but the customer will then be checking out in the currency of your gateway which may be limited by the gateway provider.
The only way to be sure would be to reach out to the companies you are interested in using to see if any of them support multi-currency checkout via their Shopify integration.
Are you looking to be able to sell in more than one currency for your main store here?