When to test In App Purchase for iOS?

Question

iOS

How to test In App Purchase products, more precisely at what point. I created an app in ios connect, created goods, all certificates are received, the app is signed, there is a contract with apple. So, do you need to send goods for approval in order to test them? If you need to send them for approval, then the first product must be sent along with the first version of the app, but if the products are not tested there, why submit the app? I can not understand this moment, I'm confused.
In the current state of cordova cc.fovea.cordova.purchase, when trying to get information about a product, it says that the product is invalid.
Thanks

Answer 1

No, you can test without approval.
https://developer.apple.com/library/ios/technotes/...
See section iTunes Connect
In short, you need to create a test account and test through the sandbox

Answer 2

Namely, in iTunes-Connect, go to Users and Roles - Sandbox-testers and create a test user. Then this user can be used for testing.