# @mostajs/school-billing — fiche LLM
RÔLE
  Frais scolaires : inscription/mensuel/par niveau + remises/promotions + factures/reçus + abonnement mensuel. Autonome/DB-agnostique.
  Compose (injectés) : payment (encaissement), subscriptions-plan (mensuel), numbering (n° reçu), file-export (reçu). Alimente reporting. Délègue l'élève à @mostajs/school.
EXPORTS
  createSchoolBilling({ repositories, payment?, subscriptionsPlan?, numbering?, fileExport?, now? }) -> { fees, discounts, invoices, subscribeMonthly, revenue }
  createMemoryRepositories(); FeeSchema, DiscountSchema, InvoiceSchema
API
  fees.define({label,kind:'inscription'|'mensuel'|'niveau',amount})/list ; discounts.define({label,type:'percent'|'amount',value,code})/list/byCode
  invoices.create(studentId,{feeIds,discountCode|discountId})->{subtotal,reduction,total,receiptNo}/pay(id,{method})/listByStudent/outstanding/get/receipt(id,format)
  subscribeMonthly(studentId,planId) [subscriptions-plan] ; revenue({from,to})
PIÈGES
  - remise percent (×%) ou amount (montant fixe, plafonné au subtotal). pay compose payment.charge. mensuel = subscriptions-plan (scope 'student').