iOS In App Purchase: Will Apple reviewers test live or sandbox environment?

Question

I use In App Payment to sell ingame consumables. After successfull payment I forward the payment receipt to my backend, which validates the receipt with the iTunes payment b

Answer 1

@Jan P's answer is correct. If you're looking for a quick YES/NO answer, the specific answer from the FAQ is;

You should use the sandbox while your application is in review.

(15) What url should I use to verify my receipt ? Use the sandbox URL https://sandbox.itunes.apple.com/verifyReceipt while testing your application in the sandbox and while your application is in review.