Custom fields in Opportunities not showing up in REST API

[Anonymous]

Hello,

I've been trying to use the new REST end points for the Marketo Opportunity object, documents here:

Marketo REST APIs: Opportunity Objects » Marketo Developers

I've noticed though that I can't update, or access custom fields we added to our opportunity object. Instead I get 1006 errors on the custom fields in the response object.  Is this not supported yet? Or is there some trick i'm missing?

Thanks!