(I don't know if this is relevant to any other game than WoW)

Game versions can be polled from the API, as well as game flavors from another endpoint, but there is no endpoint providing a version ID ( needed for autoreleasing) as well as both the corresponding game flavor and game version for each version ID provided.

Get Versions - V2 gives version items containing a version ID and a game version. (no flavor)
Get Version Types gives version items containing a version ID and a game flavor. (no game version)

I admit that it is technically possible to poll data from both endpoints and compile the desired result, (Example: the version ID of the latest game version for a given flavor) but it would be really simpler to have both a game version AND a game flavor on every item, from one single endpoint, to get the relevant version ID in one single request.

Example of what I expect from such an endpoint:
{
{"flavor": retail, "gameVersion": 1.2.3, "id":987, ...},
{"flavor": retail, "gameVersion": 4.5.6, "id": 654, ...},
{"flavor": classic, "gameVersion": 7.8.9, "id": 321, ...},
…
}