Opinion seems to be split on whether an app binary is required to be uploaded to iTunes Connect before a testing an in-app purchase. I've created the app (no binary uploaded yet), created the in-app purchase, enabled by App ID for in-app purchase and marked the purchase "available for sale". I've followed the instructions in the guide as far as I can tell.

However, when I try it on my device I am unable to retrieve the products - SKProductRequest returns my request product as invalid.

Any suggestions what I need to do?

Does the in-app purchase product need to "Developer Approved" for this to work?

Any definitive answer on whether a binary needs to be uploaded? I would like to avoid that if possible but am willing to do it if required.