Handle Banking Agent Transactions with Kantuta POS

// TransaccionAgente — entity shape (extends BaseEntityAudit)
// BaseEntityAudit provides: estado, id_user_create, id_user_update, created_at, updated_at
export interface TransaccionAgente extends BaseEntityAudit {
  id: number;
  banco: string;                           // Free-text bank name (e.g. "BCP", "Tigo Money")
  tipo_operacion: "DEPOSITO" | "RETIRO" | "TRANSFERENCIA_QR";
  monto: number;                           // Transaction principal in Bs.
  comision_cliente: number;                // Fee charged to the customer in Bs.
  comision_banco: number;                  // Fee paid back by the bank in Bs.
  nro_referencia: string;                  // Unique bank-issued reference code
  url_comprobante: string | null;          // Optional receipt/voucher URL
  fecha: string;                           // Transaction timestamp (ISO string)
  id_sesion_caja: number;
}

export interface CrearTransaccionAgenteRequest {
  banco: string;
  tipo_operacion: "DEPOSITO" | "RETIRO" | "TRANSFERENCIA_QR";
  monto: number;
  comision_cliente?: number;               // Optional fee charged to the customer in Bs.
  nro_referencia: string;
  id_sesion_caja: number;
  id_user_create: number;
}