Merchant of records for downloadable software

[jacopol]

Hi everyone. 

I'm looking for a merchant of records that can be integrate seamlessly with Shopify in order to sell globally my software without having to deal myself with international taxation. 

I did some research but can't seem to find one, do you have any suggestion? 

As of now I evaluated: 
- 2Checkout (2MONETIZE plan): Can't be integrated with 3rd party carts. 
- Paddle: Can't be integrated with 3rd party carts. 
- Global-e: No digital products and high revenue entry threshold.
- Digital River: Can't find documentation on integration with Shopify. 
- FastSpring: Can't find documentation on integration with Shopify. 

Thanks!