I have three purchaseProduct result and i dont use verifyReceipt when buy sucess.

## Platform
- [x] iOS
- [ ] macOS
- [ ] tvOS

### In-app purchase type
- [ ] Consumable
- [x] Non-consumable
- [ ] Auto-Renewable Subscription
- [ ] Non-Renewing Subscription

### Environment
- [x] Sandbox
- [ ] Production

### Version
*Please replace this with the version of SwiftyStoreKit you're using.*

## Report

I have three `purchaseProduct` result and I don't use `verifyReceipt` when buying is successful. I restart my app first, I can get `SwiftyStoreKit.completeTransactions` handler. The purchases are right (have three values), but I shut down my app. Restart it. The purchases just have one value. I don't use `SwiftyStoreKit.finishTransaction`. Is that why? (third product is the same product)