[tomaszs]

From a user perspective it is better for me to have one invoice from Shopify, in the right format with all necessary information and with additional tax documents required by law.

If I had to set up payments for each extension and go through gathering invoices and documents it would be devastating.

So as long as I understand the author I also understand why Shopify wants the billing API to be used.

Also easy pay = more users ...

[victorNicollet]

On the other hand, if you pay $2000/month for some other service, you may be unhappy with having to pay an additional $500 just to have it connect to Shopify to expose some data.

[tomaszs]

I don't know what costs so much. But I know gathering documentation from multiple small vendors across the world, additional taxes can be more expensive than $500