Classic IAP link:
Here...
If you've set up everything ok in your code (correct product ID etc.), wait about 24 hours for the product to be properly on iTunes.
So try again tomorrow and see if it returns the correct product ID.
For the product to get in review, you have to provide a screenshot showing what the app does after purchasing (eg. where you show "Congratulations on your purchase" or something).
Also I've read that it's better to be completely signed out from iTunes when testing in app purchases.
Then you login with the test account when the IAP asks for it.