Swiftystorekit in iMessage App Extension

### Platform

- [ ] iOS

### In app purchase type

- [ ] Non-consumable

### Environment

- [ ] Sandbox

### Version
SwiftyStoreKit (0.13.1)

### Related issues

## Report

### Issue summary
I want to use Swifetystorekit in an iMessage extension app. Im doing simple tests from new Xcode projects.
1) - When i test it on my developper device, with the method **Retrieve products info** it works.
The console print the right informations that means the links with app store and iTunes connect works.

2) - However, when i test the **Verify Purchase** method with a sandbox account on my developper device. the console print this :
Receipt verification failed: networkError(error: Error Domain=SSErrorDomain Code=4 "Connexion à l’iTunes Store impossible" UserInfo={NSLocalizedDescription=Connexion à l’iTunes Store impossible})

When i do the step 1 and 2 on a new single view App all is working. But the step 2 never works on a iMessage extension project.

Can you help me to fix this problem, my knowledge are not enough to solve my issue.
If you need more informations to understand my problem, just ask me.

Thanks