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Given a session, business session, user, business, transaction, or transaction party, look up which fraud networks it belongs to. Every variant returns the same shape - {"results": [EntityNetworkMembership, ...]} - so you can point any entity you already have a UUID for at the matching endpoint without a separate lookup step. Each EntityNetworkMembership carries the network summary (network, same shape as list networks), the resolved subject, which signal_types connected it, signal_count, and joined_at/last_seen_at. An entity with no fraud connections returns an empty results array, not a 404.
The transaction endpoint resolves membership through the transaction’s backing session’s subject. The transaction party endpoint resolves it through the party itself, which is what you want for a remitter or beneficiary that is not the transaction’s own KYC subject.