I integrated the Apple in app SDK, but when using SK Products Request to obtain the product ID, it was empty and invalid. I checked the app backend status and product status, and they are both normal. What's going on? I hope to receive an effective answer and solution as soon as possible. Thank you very much!

Hello: After integrating the in app SDK, I was able to request product lists and initiate payments normally. However, when running on the emulator and using a sandbox account for payment, I did not receive any callback from the app after successful payment, and the payment would be automatically initiated again. What caused this problem? Is it a problem with the sandbox account or the simulator? I hope to receive a reply as soon as possible. Thank you very much!

Hello: The App Store provides https://developer.apple.com/help/app-store-connect/configure-in-app-purchase-settings/enter-server-urls-for-app-store-server-notifications When the server interfaces with this interface, it is found that the specific user account cannot be found. How should I know which user initiated the subscription, or which user automatically subscribed during automatic renewal? Do you have a user account or ID? I hope to receive your complete answer as soon as possible. Best wishes.