Get a customer's derived loyalty account (fidélité, palier)
Recomputes a CUSTOMER’s loyalty standing from the ledger: the balance redeemable right now (expiry-aware when the program config sets an expiry policy), the monotonic lifetimePoints, and the tier those lifetime points resolve to under the active program. This is the authoritative number to quote before a redemption — the directory row from listLoyaltyMembers is a read model. 404s when the customer has no ledger entry at all (never enrolled or never earned).
Authorizations
Authorization: Bearer <token>. Accepts EITHER a Keycloak access token (scopes-in-token) OR an opaque POS session token; both resolve to the same pos.* scope vocabulary the route guards enforce.
Path Parameters
The customer id whose derived loyalty account to read (client Customer.id).
1Response
The derived account: live balance, lifetime points and resolved tier.

