Read the credit wallet, ledger and usage
Returns everything the Centrale credits-and-notifications page renders in one call: the current wallet (materialized balance, subscribed plan tier and renewal date), every ledger movement (top-ups, plan grants, debits, refunds, adjustments), the usage events each send produced, the per-store byStore ventilation of sends and credits spent, and a lowBalance flag tripped at lowBalanceThreshold. Reach for this to answer how many credits are left, where they went, or why the low-balance banner is showing; it takes no parameters and returns the whole (unpaginated) history.
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.
Response
The wallet, its ledger, the usage events, the per-store split and the flag.

