Are you using OAuth to authenticate these requests? There's currently a known issue affecting OAuth authentication for object APIs in developer preview (Tickets API and Products API). We're working to fix that now; in the interim, you should be able to use your hapikey to make requests to the Products API.
I’m wanting to do some api work on the developer test account. I don’t have Sales Pro on my regular account. I also can’t use the products functionality on the developer account. Do I need to have Sales Pro on my regular account in order to see it on the dev account?
Just wanted to post an update here; in order to adequately diagnose the variety of reasons access might be missing, I'll need the Hub IDs of the affected portals. Can everyone who has not yet done so post their Hub ID so that I can check into specific portals? It'd also be helpful to know if it's a test or production portal, and whether you're using a hapikey or OAuth (due to the aforementioned OAuth issue).
No news as of yet; the main issue here seems to be more complicated than we initially thought. We're still working on a fix that should resolve most access issues for the new APIs, so stay tuned. I'll post any updates/new info in this thread.