Who this connection is and what it can reach

Confirms the connection works and reports exactly what it can do: the account, the shops in scope, and the granted scopes.

shops is the shops this KEY can reach, which is not always what the account owns — a connector authorized for two shops reports two. Read scopes before attempting a write: a key without read_write gets a 403 from every write endpoint.

Cheap and side-effect free, so it is the right first call to verify a connection rather than a real query that might fail for its own reasons.