Getting the same receipt with the same objects marked as purchased for different sandbox users

### Platform

- [x] iOS
- [x] macOS
- [ ] tvOS

### In app purchase type

- [ ] Consumable
- [x] Non-consumable
- [ ] Auto-Renewable Subscription
- [ ] Non-Renewing Subscription

### Environment

- [x] Sandbox
- [ ] Production

### Version
ℹ 0.15.0

## Report

### Issue summary
ℹ I retrieve the receipt of my app using different sandbox users. The receipt is always the same.

### What did you expect to happen
ℹ If I purchase an item using one sandbox user, that item will appear as purchased for a different sandbox user.

### What happened instead
ℹ objects purchased for a given sandbox user should not appear purchased for another user.