List scope catalogs
Returns, for every product that has published one, the dimensions a partner can be scoped on in that product — the WHERE half of a partner, next to the collections and verbs of its permissions. Each product declares its own catalog when it starts, so the list follows the products actually deployed; a product absent from it publishes none, and any scope line for it is refused with IDE-1042 on a partner write.
Called when a partner editor opens, to render one picker per dimension in tree order (the first dimension is the top of the funnel; each later one narrows inside it). The rules a partner write is held to come from here: a required dimension must have a scope line (IDE-0001), a dimension that is not multi takes one value (IDE-0002), and listing or creating in a dimension’s collection is denied to a partner scoped on it, because that is where its siblings live.
Read-only and global: the catalog describes the product, not your organization, so every caller sees the same list.
Failures:
403— your token does not hold thepartnersresource.503 IDE-0060— the identity provider is unavailable (unreachable, too slow to answer, or failing). Nothing about the request was wrong; retry it later.

