I cannot test IAP using sandbox account that I logged on from settings, it keeps show my regular Apple ID when I try to test IAP from TestFlight This issue frustrate me and bunch of my colleagues, we cannot manage our subscription when sandbox account is default choosing Apple ID I've seen people complaining about this issue a lot Any help on resolving this issue would be really appreaciated

I am developing and implementing App Store Server Notification V2 for IAP for renewable subscription and consumables for an app My current flow is on receiving notification from apple, I will process the notification (e.g activate subscription, cancel subscription, etc.). But the ONE_TIME_PURCHASE notificationType only received in sandbox environment, the docs also said the same The ONE_TIME_CHARGE notification is currently available only in the sandbox environment. What is the best way for me to process user ONE_TIME_CHARGE transaction of consumables using App Store Server Notification V2 on production build app? Thank you