App2Web on iOS - a web checkout link can be used in addition to, but not as a replacement for, IAP in the the United States
β you are 100% allowed to link out for any reason in the USA
β you MUST link out to Safari, not an SFViewController, although apple has made exceptions on a case by case basis
β if you are linking out to the web to purchase, you must offer an IAP option on the paywall (not buried in settings) as well
β Apple does not care how you "merchandise" (this is Apple-speak for "how you present your pricing options / language on the paywall") although you CANNOT confuse customers
β You can show different prices / offers between the web / iOS
β You do NOT need to specifically call out "checkout on the web" or "checkout in-app" - but both options need to be available of equal-ish footing (subjective to the reviewer) from the same page
β Big exception for "reader" apps - these are the Netflixes / Spotifies of the world: (1) not required to use IAP (2) in the USA they can link out to external safari without offering IAP
Requirement to offer IAP is one rule, applicable to everyone except reader apps
Allowance to link out to Safari to pay is another rule, applicable only to the USA storefront and any other countries that enforce it