I think the 20% is the fee for Shopify as a whole, not the payment processing fee. Since payment processing is a small portion of what they offer at Shopify its not an apples to apples comparison with Stripe.

Shopify does provide other qualities for the 20%:

- Seamless integration with the merchant billing system. I.e. free trial(s) are credit card up-front automatically, with zero friction for the user.

- "Free" marketing in the App Store.

- Access to paid advertising in the App Store.

Good partner support is just not one of them :)

There is some confusion.

This is revshare of what the shopify partner bills the shopify store owner.

It's identical to apple charging developers a revshare of payments billed through the app store.

Not saying it's good here, just clarifying that it's not card processing fees, it's platform fees + billing fees.

Yeah it sucks, I just think of it as the marketing fee. I have done literally zero marketing other than put my app on their store and it has been selling for 6 years now.

As of now, the app pays for the mortgage, car payment and then some so I can't complain too much I guess.