“if you are still in the small business program only paying Apple 15% it's going to be pretty tough to make the numbers work on external purchases you know this is a massive drop in revenue per user sending them to the web versus only using IAP”

If you're on Apple's 15% Small Business Program, external payments math doesn't work

The economics of routing users to web payments only hold up when paying Apple 30%. At 15%, the friction of leaving the app and lower web trial start rates erode any fee savings — resulting in a net revenue drop. Developers under the Small Business Program should stay fully in-app for now.