Hello.
When We stop publishing App(Developer removed from sale),
if App doing IAP, IAP contents become stop publishing automatically?
(SKProductsRequest start return 0 contents?)
Best regards.
If App stop publishing, IAP contents become removed from sale?
Nope. You remove the IAP from sale independent of the app itself. And you can never remove access to those who have already purchased the IAP and want to restore the purchase.