[Closed] Do I need TestFlight to test Unity IAP for my iOS app?

Hello. I tried to implement Unity IAP in my new app (first time using IAP). I followed the following tutorials but failed. It said in Xcode that 'No available product'.

https://unity3d.com/learn/tutorials/topics/ads-analytics/integrating-unity-iap-your-game
https://docs.unity3d.com/Manual/UnityIAPAppleConfiguration.html

(I checked in iTunes connect and Xcode a few times, and am pretty sure that I did all these things mentioned in these tutorials)

My questions are:
1. Do I need TestFlight to test Unity IAP for my iOS app?
2. I haven't submitted my app yet. Do I have to submit my app first?

Thank you very much for your help.

 

All is fine now. All I had to do is to complete Agreements, Tax, and Banking for paid applications first. What a naive past me.