feat(F-188): completed feature

backlog/features.json

@@ -7240,13 +7240,15 @@
       "description": "Allow cashier orders to remain pending with outstanding balance and ensure fully paid POS orders are COMPLETED.",
       "priority": "high",
       "risk": "high",
-      "status": "pending",
+      "status": "done",
       "created_at": "2026-08-22",
       "gates": {
-        "reviewer": false,
+        "reviewer": true,
-        "security": false,
+        "security": true,
-        "qa": false
+        "qa": true,
-      }
+        "close": true
+      },
+      "completed_at": "2026-08-22T20:44:36Z"
     },
     {
       "id": "F-189",

docs/pos/POS_CHECKOUT.md

@@ -71,7 +71,7 @@ Las operaciones de estado y eliminación solo admiten objetivos con rol `pos_cas
 7. Cuando el pendiente sea cero, pulsa **Confirmar y cerrar ticket**.
 8. Imprime o envía el ticket por email. La caja se limpia después de completar una de estas acciones.
 
-Una venta totalmente pagada queda en estado `COMPLETED`. Los pagos pendientes se implementan aparte en F-188.
+Una venta totalmente pagada queda en estado `COMPLETED`. Cuando los pagos asignados son menores al total, la venta queda en estado `PENDING` y se registra el importe pendiente (`outstandingCents`). El cobro del resto se hace con `POST /pos/sales/:id/payments`.
 
 ## Contrato de venta
 
@@ -113,7 +113,8 @@ No reserva ni descuenta inventario. La base de datos exige que `product_id` y `v
 }
 ```
 
-- La suma de `amountCents` debe coincidir exactamente con el total.
+- La suma de `amountCents` puede ser igual o menor al total. Si es menor, la venta queda `PENDING` con ese importe pendiente.
+- Si supera el total, el backend rechaza con `POS_PAYMENT_OVERPAYMENT`.
 - Solo un método de tipo efectivo acepta `tenderedCents`.
 - `tenderedCents` debe ser mayor o igual que el importe aplicado.
 - El cambio es `tenderedCents - amountCents`.
@@ -160,7 +161,6 @@ El efectivo esperado aumenta por el importe aplicado, no por el efectivo entrega
 
 ## Próximas ampliaciones
 
-- F-188: ventas con saldo pendiente.
 - F-189: cantidades negativas, devoluciones parciales/totales y ticket de devolución.
 - F-190: auditoría completa de actualización/refresco de reporting.
 - F-191: cierre de terminal y cierre diario conciliando efectivo, tarjetas, devoluciones y pendientes.

project/apps/pos/src/app/(terminal)/page.tsx

@@ -11,6 +11,7 @@ import { formatPrice } from '@/lib/money';
 import type {
   PaymentAllocation,
   PaymentMethod,
+  PosPendingSale,
   PosReceipt,
   PosSaleResponse,
 } from '@/types/checkout';
@@ -107,6 +108,10 @@ export default function RegisterPage() {
   const [creatingCustomer, setCreatingCustomer] = useState(false);
   const [processing, setProcessing] = useState(false);
   const [error, setError] = useState('');
+  const [pendingSales, setPendingSales] = useState<PosPendingSale[]>([]);
+  const [loadingPending, setLoadingPending] = useState(false);
+  const [restPaymentFor, setRestPaymentFor] = useState<PosPendingSale | null>(null);
+  const [processingRest, setProcessingRest] = useState(false);
 
   const loadConfig = useCallback(async () => {
     setConfigError('');
@@ -125,6 +130,29 @@ export default function RegisterPage() {
     void loadConfig();
   }, [loadConfig]);
 
+  const loadPendingSales = useCallback(async () => {
+    if (!config?.session || config.session.status !== 'OPEN') {
+      setPendingSales([]);
+      return;
+    }
+    setLoadingPending(true);
+    try {
+      const data = await posApi.listSales<{ items: PosPendingSale[] }>({
+        state: 'PENDING',
+        sessionId: config.session.id,
+      });
+      setPendingSales(data.items ?? []);
+    } catch {
+      setPendingSales([]);
+    } finally {
+      setLoadingPending(false);
+    }
+  }, [config?.session?.id, config?.session?.status]);
+
+  useEffect(() => {
+    void loadPendingSales();
+  }, [loadPendingSales]);
+
   useEffect(() => {
     if (!config?.session || config.session.status !== 'OPEN') return;
     void posApi
@@ -340,8 +368,12 @@ export default function RegisterPage() {
       setError('Carrito vacío');
       return;
     }
-    if (remainingCents !== 0 || paidCents !== totals.total) {
+    if (payments.length === 0 || paidCents <= 0) {
-      setError('Asigna el total entre las formas de pago antes de confirmar');
+      setError('Asigna al menos un pago antes de confirmar');
+      return;
+    }
+    if (paidCents > totals.total) {
+      setError('Los pagos asignados superan el total');
       return;
     }
     setProcessing(true);
@@ -374,6 +406,8 @@ export default function RegisterPage() {
         ...(customer ? { customerId: customer.id } : {}),
       });
       setReceipt(result.receipt);
+      setRestPaymentFor(null);
+      void loadPendingSales();
     } catch (err) {
       setError(err instanceof Error ? err.message : 'No se pudo confirmar la venta');
     } finally {
@@ -381,6 +415,40 @@ export default function RegisterPage() {
     }
   };
 
+  const openRestPayment = (sale: PosPendingSale) => {
+    setRestPaymentFor(sale);
+    setError('');
+  };
+
+  const submitRestPayment = async (allocation: PaymentAllocation) => {
+    if (!config?.session || !restPaymentFor) return;
+    setProcessingRest(true);
+    setError('');
+    try {
+      const result = await posApi.payRest<PosSaleResponse>(restPaymentFor.id, {
+        idempotencyKey: generateIdempotencyKey(),
+        cashSessionId: config.session.id,
+        terminalId: config.terminal.id,
+        payments: [
+          {
+            methodCode: allocation.methodCode,
+            amountCents: allocation.amountCents,
+            ...(allocation.kind === 'cash' ? { tenderedCents: allocation.tenderedCents } : {}),
+          },
+        ],
+      });
+      setRestPaymentFor(null);
+      if (result.state === 'COMPLETED' && result.outstandingCents === 0) {
+        setReceipt(result.receipt);
+      }
+      void loadPendingSales();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'No se pudo aplicar el cobro');
+    } finally {
+      setProcessingRest(false);
+    }
+  };
+
   const resetCashier = () => {
     setReceipt(null);
     setCart([]);
@@ -530,6 +598,44 @@ export default function RegisterPage() {
 
   return (
     <div className="flex h-screen" style={{ '--color-primary': '#2D6A4F' } as React.CSSProperties}>
+      <aside
+        className="hidden w-64 shrink-0 flex-col border-r bg-amber-50/40 p-3 lg:flex"
+        aria-label="Pendientes de caja"
+      >
+        <div className="mb-3">
+          <h2 className="text-sm font-bold text-[#2D6A4F]">Pendientes de caja</h2>
+          <p className="text-xs text-gray-500">
+            Ventas con saldo pendiente en esta sesión.
+          </p>
+        </div>
+        {loadingPending ? (
+          <p className="text-xs text-gray-500">Cargando…</p>
+        ) : pendingSales.length === 0 ? (
+          <p className="text-xs text-gray-500">Sin ventas pendientes.</p>
+        ) : (
+          <ul className="flex flex-1 flex-col gap-2 overflow-y-auto">
+            {pendingSales.map((sale) => (
+              <li
+                key={sale.id}
+                className="rounded-xl border border-amber-200 bg-white p-3 text-sm shadow-sm"
+              >
+                <p className="font-semibold text-gray-800">{sale.receiptNumber ?? sale.id.slice(0, 8)}</p>
+                <p className="text-xs text-gray-500">
+                  Total {formatPrice(sale.totalCents)} · pendiente {formatPrice(sale.outstandingCents)}
+                </p>
+                <button
+                  type="button"
+                  onClick={() => openRestPayment(sale)}
+                  disabled={processingRest}
+                  className="mt-2 w-full rounded-lg bg-amber-500 px-3 py-1.5 text-xs font-bold text-white disabled:opacity-50"
+                >
+                  Cobrar resto
+                </button>
+              </li>
+            ))}
+          </ul>
+        )}
+      </aside>
       <main className="flex min-w-0 flex-1 flex-col overflow-hidden border-r p-4">
         <div className="mb-3">
           <div className="mb-2 flex items-center gap-2">
@@ -939,16 +1045,34 @@ export default function RegisterPage() {
             </button>
           ))}
         </div>
-        <button
+        <div className="mt-3 grid grid-cols-2 gap-2">
-          type="button"
+          <button
-          onClick={() => void confirmSale()}
+            type="button"
-          disabled={
+            onClick={() => void confirmSale()}
-            processing || cart.length === 0 || remainingCents !== 0 || paidCents !== totals.total
+            disabled={
-          }
+              processing ||
-          className="mt-3 min-h-16 w-full rounded-xl bg-[#1B4332] text-lg font-bold text-white disabled:opacity-40"
+              cart.length === 0 ||
-        >
+              payments.length === 0 ||
-          {processing ? 'Confirmando…' : 'Confirmar y cerrar ticket'}
+              paidCents <= 0 ||
-        </button>
+              paidCents > totals.total
+            }
+            className="min-h-16 rounded-xl bg-[#1B4332] text-lg font-bold text-white disabled:opacity-40"
+          >
+            {processing
+              ? 'Confirmando…'
+              : paidCents < totals.total
+                ? 'Guardar pendiente'
+                : 'Cobrar e imprimir'}
+          </button>
+          <button
+            type="button"
+            onClick={() => resetCashier()}
+            disabled={processing || cart.length === 0}
+            className="min-h-16 rounded-xl border border-gray-300 bg-white text-sm font-bold text-gray-700 disabled:opacity-40"
+          >
+            Vaciar caja
+          </button>
+        </div>
       </aside>
 
       {showDiscountPanel && selectedItem && (
@@ -976,6 +1100,64 @@ export default function RegisterPage() {
           onClose={() => setPaymentMethod(null)}
         />
       )}
+      {restPaymentFor && (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 p-4"
+          role="dialog"
+          aria-modal="true"
+          aria-labelledby="rest-payment-title"
+        >
+          <div className="w-full max-w-md space-y-4 rounded-2xl bg-white p-6 shadow-2xl">
+            <div className="flex items-start justify-between gap-4">
+              <div>
+                <p className="text-sm font-semibold text-amber-600">
+                  Pendiente {formatPrice(restPaymentFor.outstandingCents)}
+                </p>
+                <h2 id="rest-payment-title" className="text-2xl font-bold text-gray-900">
+                  Cobrar resto
+                </h2>
+                <p className="mt-1 text-xs text-gray-500">
+                  Venta {restPaymentFor.receiptNumber ?? restPaymentFor.id.slice(0, 8)}
+                </p>
+              </div>
+              <button
+                type="button"
+                onClick={() => {
+                  if (!processingRest) setRestPaymentFor(null);
+                }}
+                aria-label="Cerrar"
+                className="text-2xl text-gray-400 hover:text-gray-700"
+              >
+                ✕
+              </button>
+            </div>
+            <div className="grid grid-cols-2 gap-2">
+              {config.paymentMethods.map((method) => (
+                <button
+                  key={method.id}
+                  type="button"
+                  onClick={() => setPaymentMethod(method)}
+                  disabled={processingRest}
+                  className={`min-h-14 rounded-xl px-2 font-bold text-white disabled:opacity-40 ${method.kind === 'cash' ? 'bg-green-600' : method.kind === 'card' ? 'bg-blue-600' : 'bg-slate-700'}`}
+                >
+                  {method.kind === 'cash' ? '💵' : method.kind === 'card' ? '💳' : '◉'} {method.label}
+                </button>
+              ))}
+            </div>
+            {error && <p className="text-sm text-red-600">{error}</p>}
+          </div>
+        </div>
+      )}
+      {paymentMethod && restPaymentFor && (
+        <PaymentModal
+          method={paymentMethod}
+          remainingCents={restPaymentFor.outstandingCents}
+          onAdd={(allocation) => {
+            void submitRestPayment(allocation);
+          }}
+          onClose={() => setPaymentMethod(null)}
+        />
+      )}
       {receipt && (
         <ReceiptModal
           receipt={receipt}

project/apps/pos/src/lib/api-client.ts

@@ -60,6 +60,20 @@ export const posApi = {
   /** Atomically confirm a fully allocated sale. */
   createSale: <T>(data: unknown) =>
     apiFetch<T>('/pos/sales', { method: 'POST', body: JSON.stringify(data) }),
+  /** Apply additional payments to a pending POS sale. */
+  payRest: <T>(orderId: string, data: unknown) =>
+    apiFetch<T>(`/pos/sales/${encodeURIComponent(orderId)}/payments`, {
+      method: 'POST',
+      body: JSON.stringify(data),
+    }),
+  /** List POS sales for the session, optionally filtered by state. */
+  listSales: <T>(params?: { state?: 'PENDING' | 'COMPLETED'; sessionId?: string }) => {
+    const qs = new URLSearchParams();
+    if (params?.state) qs.set('state', params.state);
+    if (params?.sessionId) qs.set('sessionId', params.sessionId);
+    const tail = qs.toString();
+    return apiFetch<T>(`/pos/sales${tail ? `?${tail}` : ''}`);
+  },
   /** Email the immutable generated receipt. */
   emailReceipt: <T>(orderId: string, email: string) =>
     apiFetch<T>(`/pos/sales/${encodeURIComponent(orderId)}/receipt/email`, {

project/apps/pos/src/types/checkout.ts

@@ -66,7 +66,23 @@ export interface PosReceipt {
 export interface PosSaleResponse {
   orderId: string;
   receiptNumber: string;
+  state: 'PENDING' | 'COMPLETED';
   totalCents: number;
+  paidCents: number;
+  outstandingCents: number;
   changeCents: number;
   receipt: PosReceipt;
 }
+
+export interface PosPendingSale {
+  id: string;
+  state: 'PENDING' | 'COMPLETED';
+  totalCents: number;
+  paidCents: number;
+  outstandingCents: number;
+  subtotalCents: number;
+  discountCents: number;
+  createdAt: string;
+  cashierEmail?: string | null;
+  receiptNumber?: string | null;
+}

project/src/app/tests/pos-pending-payments.itest.ts

@@ -0,0 +1,259 @@
+import { createHash } from 'node:crypto';
+import argon2 from 'argon2';
+import type pg from 'pg';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { buildApp } from '../build-app.js';
+import { CreatePosSaleUseCase } from '../../modules/pos/index.js';
+import { createPool } from '../../infrastructure/db/pool.js';
+import {
+  getTestDbUrl,
+  recreateDatabase,
+  runMigrations,
+} from '../../infrastructure/db/tests/db-test-support.js';
+
+const hasDb = Boolean(process.env.TEST_DATABASE_URL);
+const STORE_ID = '00000000-0000-0000-0000-000000000001';
+const TERMINAL_ID = '20000000-0000-4000-8000-000000000188';
+const SESSION_ID = '30000000-0000-4000-8000-000000000188';
+const USER_ID = '10000000-0000-4000-8000-000000000188';
+const SESSION_TOKEN = 'f188-session';
+const PRODUCT_ID = '40000000-0000-4000-8000-000000000188';
+const VARIANT_ID = '50000000-0000-4000-8000-000000000188';
+
+function tokenHash(token: string): string {
+  return createHash('sha256').update(token).digest('hex');
+}
+
+function cookie(token: string): string {
+  return `backoffice_session=${token}`;
+}
+
+describe.skipIf(!hasDb)('F-188 POS pending payments (real PostgreSQL)', () => {
+  const url = hasDb ? getTestDbUrl() : '';
+  let pool: pg.Pool;
+  let app: Awaited<ReturnType<typeof buildApp>>;
+
+  beforeAll(async () => {
+    await recreateDatabase(url);
+    await runMigrations(url, 'up');
+    pool = createPool(url);
+    const passwordHash = await argon2.hash('cashier-188');
+    await pool.query(
+      `INSERT INTO backoffice_users (id, email, password_hash, role)
+       VALUES ($1, 'cashier-f188@example.test', $2, 'pos_cashier')`,
+      [USER_ID, passwordHash],
+    );
+    await pool.query(
+      `INSERT INTO backoffice_sessions (user_id, token_hash, expires_at)
+       VALUES ($1, $2, now() + interval '1 hour')`,
+      [USER_ID, tokenHash(SESSION_TOKEN)],
+    );
+    await pool.query(
+      `INSERT INTO pos_terminals (id, store_id, name, binding_code, bound_at)
+       VALUES ($1, $2, 'Caja F-188', 'F188CODE', now())`,
+      [TERMINAL_ID, STORE_ID],
+    );
+    await pool.query(
+      `INSERT INTO pos_cash_sessions (
+         id, terminal_id, store_id, user_id, opening_cash_cents, expected_cash_cents
+       ) VALUES ($1, $2, $3, $4, 1000, 1000)`,
+      [SESSION_ID, TERMINAL_ID, STORE_ID, USER_ID],
+    );
+    await pool.query(
+      `INSERT INTO catalog_products (id, name, slug, state)
+       VALUES ($1, 'Producto F-188', 'producto-f188', 'active')`,
+      [PRODUCT_ID],
+    );
+    await pool.query(
+      `INSERT INTO catalog_product_variants (id, product_id, sku, ean)
+       VALUES ($1, $2, 'SKU-F188', '8412345678902')`,
+      [VARIANT_ID, PRODUCT_ID],
+    );
+    await pool.query(
+      `INSERT INTO pricing_variant_prices (variant_id, net_unit_amount_cents, vat_rate)
+       VALUES ($1, 1000, 'reduced')`,
+      [VARIANT_ID],
+    );
+    await pool.query(
+      `INSERT INTO inventory_stock (variant_id, store_id, available)
+       VALUES ($1, $2, 10)`,
+      [VARIANT_ID, STORE_ID],
+    );
+    app = await buildApp({ pool, cookieSecure: false });
+  });
+
+  afterAll(async () => {
+    await app.close();
+    await pool.end();
+  });
+
+  it('persists a partially paid POS order as PENDING with outstandingCents', async () => {
+    const useCase = new CreatePosSaleUseCase(pool);
+    const result = await useCase.execute({
+      idempotencyKey: 'f188-partial-1',
+      cashSessionId: SESSION_ID,
+      terminalId: TERMINAL_ID,
+      userId: USER_ID,
+      items: [{ kind: 'stock', variantId: VARIANT_ID, quantity: 1, discountCents: 0 }],
+      payments: [{ methodCode: 'cash', amountCents: 600, tenderedCents: 600 }],
+    });
+    expect(result.state).toBe('PENDING');
+    expect(result.outstandingCents).toBe(400);
+    expect(result.paidCents).toBe(600);
+
+    const stored = await pool.query<{ state: string; total_cents: string }>(
+      `SELECT state, total_cents FROM orders_orders WHERE id = $1`,
+      [result.orderId],
+    );
+    expect(stored.rows[0]?.state).toBe('PENDING');
+    expect(Number(stored.rows[0]?.total_cents)).toBe(1000);
+
+    const paidBefore = await pool.query<{ sum: string | null }>(
+      `SELECT COALESCE(SUM(amount_cents), 0)::text AS sum FROM payments_transactions
+        WHERE order_id = $1 AND status = 'succeeded'`,
+      [result.orderId],
+    );
+    expect(Number(paidBefore.rows[0]?.sum)).toBe(600);
+  });
+
+  it('completes a PENDING order via the rest-payment endpoint and accumulates reporting', async () => {
+    const useCase = new CreatePosSaleUseCase(pool);
+    const before = await pool.query<{ expected_cash_cents: number }>(
+      `SELECT expected_cash_cents FROM pos_cash_sessions WHERE id = $1`,
+      [SESSION_ID],
+    );
+    const expectedBefore = Number(before.rows[0]?.expected_cash_cents ?? 0);
+    const partial = await useCase.execute({
+      idempotencyKey: 'f188-partial-2',
+      cashSessionId: SESSION_ID,
+      terminalId: TERMINAL_ID,
+      userId: USER_ID,
+      items: [{ kind: 'stock', variantId: VARIANT_ID, quantity: 1, discountCents: 0 }],
+      payments: [{ methodCode: 'cash', amountCents: 500, tenderedCents: 500 }],
+    });
+    expect(partial.state).toBe('PENDING');
+
+    const rest = await app.inject({
+      method: 'POST',
+      url: `/pos/sales/${partial.orderId}/payments`,
+      headers: { cookie: cookie(SESSION_TOKEN), 'x-terminal-id': TERMINAL_ID },
+      payload: {
+        idempotencyKey: 'f188-rest-2',
+        cashSessionId: SESSION_ID,
+        terminalId: TERMINAL_ID,
+        payments: [{ methodCode: 'cash', amountCents: 500, tenderedCents: 500 }],
+      },
+    });
+    expect(rest.statusCode).toBe(201);
+    const body = rest.json();
+    expect(body.state).toBe('COMPLETED');
+    expect(body.outstandingCents).toBe(0);
+    expect(body.paidCents).toBe(1000);
+
+    const reporting = await pool.query<{ count: number }>(
+      `SELECT COUNT(*)::int AS count FROM reporting_payment_lines WHERE order_id = $1`,
+      [partial.orderId],
+    );
+    expect(reporting.rows[0]?.count).toBe(2);
+
+    const session = await pool.query<{ expected_cash_cents: number }>(
+      `SELECT expected_cash_cents FROM pos_cash_sessions WHERE id = $1`,
+      [SESSION_ID],
+    );
+    expect(Number(session.rows[0]?.expected_cash_cents)).toBe(expectedBefore + 1000);
+  });
+
+  it('rejects overpayment on rest-payment and keeps the order PENDING', async () => {
+    const useCase = new CreatePosSaleUseCase(pool);
+    const partial = await useCase.execute({
+      idempotencyKey: 'f188-partial-3',
+      cashSessionId: SESSION_ID,
+      terminalId: TERMINAL_ID,
+      userId: USER_ID,
+      items: [{ kind: 'stock', variantId: VARIANT_ID, quantity: 1, discountCents: 0 }],
+      payments: [{ methodCode: 'cash', amountCents: 700, tenderedCents: 700 }],
+    });
+
+    const overpay = await app.inject({
+      method: 'POST',
+      url: `/pos/sales/${partial.orderId}/payments`,
+      headers: { cookie: cookie(SESSION_TOKEN), 'x-terminal-id': TERMINAL_ID },
+      payload: {
+        idempotencyKey: 'f188-rest-overpay',
+        cashSessionId: SESSION_ID,
+        terminalId: TERMINAL_ID,
+        payments: [{ methodCode: 'cash', amountCents: 500, tenderedCents: 500 }],
+      },
+    });
+    expect(overpay.statusCode).toBe(400);
+    expect(overpay.json().error.code).toBe('POS_PAYMENT_OVERPAYMENT');
+
+    const stored = await pool.query<{ state: string }>(
+      `SELECT state FROM orders_orders WHERE id = $1`,
+      [partial.orderId],
+    );
+    expect(stored.rows[0]?.state).toBe('PENDING');
+  });
+
+  it('lists POS sales with state and outstandingCents via GET /pos/sales', async () => {
+    const listed = await app.inject({
+      method: 'GET',
+      url: `/pos/sales?state=PENDING&sessionId=${SESSION_ID}`,
+      headers: { cookie: cookie(SESSION_TOKEN), 'x-terminal-id': TERMINAL_ID },
+    });
+    expect(listed.statusCode).toBe(200);
+    const body = listed.json();
+    expect(body.items.length).toBeGreaterThan(0);
+    expect(body.items[0]).toMatchObject({ state: 'PENDING' });
+    expect(typeof body.items[0].outstandingCents).toBe('number');
+  });
+
+  it('replays the same rest-payment idempotency key without duplicating rows', async () => {
+    const useCase = new CreatePosSaleUseCase(pool);
+    // Create a PENDING sale that stays PENDING after a single rest-payment.
+    const partial = await useCase.execute({
+      idempotencyKey: 'f188-partial-4',
+      cashSessionId: SESSION_ID,
+      terminalId: TERMINAL_ID,
+      userId: USER_ID,
+      items: [{ kind: 'stock', variantId: VARIANT_ID, quantity: 1, discountCents: 0 }],
+      payments: [{ methodCode: 'cash', amountCents: 400, tenderedCents: 400 }],
+    });
+    expect(partial.state).toBe('PENDING');
+
+    const first = await app.inject({
+      method: 'POST',
+      url: `/pos/sales/${partial.orderId}/payments`,
+      headers: { cookie: cookie(SESSION_TOKEN), 'x-terminal-id': TERMINAL_ID },
+      payload: {
+        idempotencyKey: 'f188-rest-idemp',
+        cashSessionId: SESSION_ID,
+        terminalId: TERMINAL_ID,
+        payments: [{ methodCode: 'cash', amountCents: 100, tenderedCents: 100 }],
+      },
+    });
+    expect(first.statusCode).toBe(201);
+    expect(first.json().state).toBe('PENDING');
+
+    const second = await app.inject({
+      method: 'POST',
+      url: `/pos/sales/${partial.orderId}/payments`,
+      headers: { cookie: cookie(SESSION_TOKEN), 'x-terminal-id': TERMINAL_ID },
+      payload: {
+        idempotencyKey: 'f188-rest-idemp',
+        cashSessionId: SESSION_ID,
+        terminalId: TERMINAL_ID,
+        payments: [{ methodCode: 'cash', amountCents: 100, tenderedCents: 100 }],
+      },
+    });
+    expect(second.statusCode).toBe(201);
+    expect(second.json().orderId).toBe(first.json().orderId);
+    expect(second.json().paidCents).toBe(first.json().paidCents);
+
+    const reporting = await pool.query<{ count: number }>(
+      `SELECT COUNT(*)::int AS count FROM reporting_payment_lines WHERE order_id = $1`,
+      [partial.orderId],
+    );
+    expect(reporting.rows[0]?.count).toBe(2);
+  });
+});

project/src/modules/pos/api/pos.routes.ts

@@ -12,6 +12,7 @@ import { GetPosConfigUseCase } from '../application/get-pos-config.js';
 import { OpenCashSessionUseCase } from '../application/open-cash-session.js';
 import { CloseCashSessionUseCase } from '../application/close-cash-session.js';
 import { CreatePosSaleUseCase } from '../application/create-pos-sale.js';
+import { ReceiveRestPaymentUseCase } from '../application/receive-rest-payment.js';
 import { buildPosReceipt } from '../application/build-pos-receipt.js';
 import { sendTransactionalEmail } from '../../notifications/index.js';
 import { Argon2PasswordHasher } from '../../identity/index.js';
@@ -62,6 +63,7 @@ export async function registerPosRoutes(app: FastifyInstance, deps: PosRouteDeps
   const paymentMethodRepo = new PgPaymentMethodRepository(pool);
   const sessionRepo = new PgCashSessionRepository(pool);
   const createPosSale = new CreatePosSaleUseCase(pool);
+  const receiveRestPayment = new ReceiveRestPaymentUseCase(pool);
 
   const listStores = new ListStoresUseCase(storeRepo);
   const listTerminals = new ListTerminalsUseCase(terminalRepo);
@@ -1321,6 +1323,8 @@ export async function registerPosRoutes(app: FastifyInstance, deps: PosRouteDeps
           type: 'object',
           properties: {
             sessionId: { type: 'string', format: 'uuid' },
+            state: { type: 'string', enum: ['PENDING', 'COMPLETED'] },
+            storeId: { type: 'string', format: 'uuid' },
             limit: { type: 'integer', minimum: 1, maximum: 100, default: 20 },
           },
         },
@@ -1330,25 +1334,129 @@ export async function registerPosRoutes(app: FastifyInstance, deps: PosRouteDeps
     async (request, reply) => {
       const user = await authenticate(request);
       requireAnyRole(user, ['admin', 'pos_manager', 'pos_cashier'] as ReadonlyArray<Role>);
-      const { sessionId, limit = 20 } = request.query as { sessionId?: string; limit?: number };
+      const params = request.query as {
-      let query = `SELECT o.id, o.total_cents AS "totalCents", o.subtotal_cents AS "subtotalCents",
+        sessionId?: string;
-                        o.discount_cents AS "discountCents", o.created_at AS "createdAt",
+        state?: string;
-                        u.email AS "userEmail"
+        storeId?: string;
-                 FROM orders_orders o
+        limit?: number;
-                 LEFT JOIN identity_users u ON u.id = o.user_id
+      };
-                 WHERE o.idempotency_key IS NOT NULL`;
+      const sessionId = params.sessionId;
-      const params: unknown[] = [];
+      const state = params.state;
+      const storeId = params.storeId;
+      const limit = Math.min(Math.max(params.limit ?? 20, 1), 100);
+      const conditions: string[] = [`o.idempotency_key IS NOT NULL`];
+      const values: unknown[] = [];
       if (sessionId) {
-        params.push(sessionId);
+        values.push(sessionId);
-        query += ` AND o.id IN (SELECT order_id FROM pos_cash_sessions WHERE id = $${params.length})`;
+        conditions.push(`o.cash_session_id = $${values.length}`);
       }
-      params.push(limit);
+      if (state) {
-      query += ` ORDER BY o.created_at DESC LIMIT $${params.length}`;
+        values.push(state);
-      const result = await pool.query(query, params);
+        conditions.push(`o.state = $${values.length}`);
+      }
+      if (storeId) {
+        values.push(storeId);
+        conditions.push(`o.store_id = $${values.length}`);
+      }
+      values.push(limit);
+      const query = `
+        SELECT o.id, o.state,
+               o.total_cents AS "totalCents", o.subtotal_cents AS "subtotalCents",
+               o.discount_cents AS "discountCents", o.created_at AS "createdAt",
+               o.store_id AS "storeId", o.terminal_id AS "terminalId",
+               o.cash_session_id AS "cashSessionId",
+               COALESCE(payments.sum_paid, 0)::int AS "paidCents",
+               (o.total_cents - COALESCE(payments.sum_paid, 0))::int AS "outstandingCents",
+               u.email AS "userEmail"
+          FROM orders_orders o
+          LEFT JOIN identity_users u ON u.id = o.user_id
+          LEFT JOIN (
+            SELECT order_id, SUM(amount_cents) AS sum_paid
+              FROM payments_transactions
+             WHERE status = 'succeeded'
+             GROUP BY order_id
+          ) payments ON payments.order_id = o.id
+         WHERE ${conditions.join(' AND ')}
+         ORDER BY o.created_at DESC
+         LIMIT $${values.length}
+      `;
+      const result = await pool.query(query, values);
       return reply.send({ items: result.rows });
     },
   );
 
+  app.post<{ Params: { id: string } }>(
+    '/pos/sales/:id/payments',
+    {
+      schema: {
+        tags: ['POS Terminal'],
+        summary: 'Apply additional payments to a pending POS sale',
+        params: { type: 'object', properties: { id: { type: 'string', format: 'uuid' } } },
+        body: {
+          type: 'object',
+          required: ['idempotencyKey', 'cashSessionId', 'terminalId', 'payments'],
+          properties: {
+            idempotencyKey: { type: 'string', minLength: 1, maxLength: 128 },
+            cashSessionId: { type: 'string', format: 'uuid' },
+            terminalId: { type: 'string', format: 'uuid' },
+            payments: { type: 'array', minItems: 1, items: { type: 'object' } },
+          },
+        },
+        response: {
+          400: errorSchema,
+          401: errorSchema,
+          403: errorSchema,
+          404: errorSchema,
+          409: errorSchema,
+        },
+      } as FastifySchema,
+    },
+    async (request, reply) => {
+      const user = await authenticate(request);
+      requireAnyRole(user, ['admin', 'pos_manager', 'pos_cashier'] as ReadonlyArray<Role>);
+      const payment = z
+        .object({
+          methodCode: z
+            .string()
+            .regex(/^[a-z0-9_-]{1,32}$/)
+            .optional(),
+          kind: z.enum(['cash', 'card', 'other']).optional(),
+          amountCents: z.number().int().min(1),
+          tenderedCents: z.number().int().min(0).optional(),
+          last4: z
+            .string()
+            .regex(/^\d{1,4}$/)
+            .optional(),
+        })
+        .refine((value) => Boolean(value.methodCode || value.kind), {
+          message: 'methodCode is required',
+        });
+      const body = parseJson(
+        z.object({
+          idempotencyKey: z.string().min(1).max(128),
+          cashSessionId: z.string().uuid(),
+          terminalId: z.string().uuid(),
+          payments: z.array(payment).min(1),
+        }),
+        request.body ?? {},
+      );
+      const boundTerminalId = request.headers['x-terminal-id'];
+      if (typeof boundTerminalId !== 'string' || boundTerminalId !== body.terminalId) {
+        throw new AppError(
+          403,
+          'POS_TERMINAL_MISMATCH',
+          'La venta no pertenece al terminal vinculado',
+        );
+      }
+      const result = await receiveRestPayment.execute({
+        orderId: (request.params as { id: string }).id,
+        userId: user.id,
+        ...body,
+      });
+      return reply.code(201).send(result);
+    },
+  );
+
   app.post<{ Params: { id: string } }>(
     '/pos/sales/:id/void',
     {

project/src/modules/pos/application/create-pos-sale.ts

@@ -103,13 +103,11 @@ export function validatePaymentAllocations(
     };
   });
   const allocatedCents = validated.reduce((sum, payment) => sum + payment.amountCents, 0);
-  if (allocatedCents !== totalCents) {
+  if (allocatedCents > totalCents) {
     throw new AppError(
       400,
-      'POS_PAYMENT_TOTAL_MISMATCH',
+      'POS_PAYMENT_OVERPAYMENT',
-      allocatedCents < totalCents
+      'Los pagos asignados superan el total de la venta',
-        ? 'Falta importe por asignar antes de confirmar'
-        : 'Los pagos asignados superan el total',
     );
   }
   return validated;
@@ -290,7 +288,7 @@ export class CreatePosSaleUseCase {
         `INSERT INTO orders_orders (
            user_id, idempotency_key, state, subtotal_cents, discount_cents, tax_cents,
            total_cents, source, terminal_id, cash_session_id, store_id, receipt_number
-         ) VALUES ($1, $2, 'COMPLETED', $3, $4, $5, $6, 'pos', $7, $8, $9, $10)
+         ) VALUES ($1, $2, 'PENDING', $3, $4, $5, $6, 'pos', $7, $8, $9, $10)
          RETURNING id, created_at`,
         [
           input.customerId ?? null,
@@ -392,6 +390,20 @@ export class CreatePosSaleUseCase {
         if (payment.kind === 'cash') cashAppliedCents += payment.amountCents;
         paymentResults.push({ id: paymentId, ...payment });
       }
+      // Recompute initial paidCents from current payments only when this is a
+      // first-time creation. Rest-payment use case has its own loader.
+      const initialPaidCents = payments.reduce((sum, p) => sum + p.amountCents, 0);
+      const orderState: 'PENDING' | 'COMPLETED' =
+        initialPaidCents < totalCents ? 'PENDING' : 'COMPLETED';
+      if (orderState === 'COMPLETED') {
+        await client.query(
+          `UPDATE orders_orders SET state = 'COMPLETED',
+                                    state_changed_at = now(),
+                                    updated_at = now()
+            WHERE id = $1`,
+          [order.id],
+        );
+      }
 
       if (cashAppliedCents > 0) {
         await client.query(
@@ -409,7 +421,10 @@ export class CreatePosSaleUseCase {
         orderId: order.id,
         idempotencyKey: input.idempotencyKey,
         receiptNumber,
+        state: orderState,
         totalCents,
+        paidCents: initialPaidCents,
+        outstandingCents: totalCents - initialPaidCents,
         changeCents: payments.reduce((sum, payment) => sum + payment.changeCents, 0),
         items,
         payments: paymentResults,
@@ -426,6 +441,12 @@ export class CreatePosSaleUseCase {
 
   private async loadResult(orderId: string, idempotencyKey: string): Promise<PosSaleResult> {
     const receipt = await buildPosReceipt(this.pool, orderId);
+    const orderRows = await this.pool.query<{ state: string }>(
+      `SELECT state FROM orders_orders WHERE id = $1`,
+      [orderId],
+    );
+    const orderState: 'PENDING' | 'COMPLETED' =
+      orderRows.rows[0]?.state === 'COMPLETED' ? 'COMPLETED' : 'PENDING';
     const paymentRows = await this.pool.query<{
       id: string;
       amount_cents: number;
@@ -459,11 +480,15 @@ export class CreatePosSaleUseCase {
       quantity: item.quantity,
       vatRate: null,
     }));
+    const paidCents = payments.reduce((sum, p) => sum + p.amountCents, 0);
     return {
       orderId,
       idempotencyKey,
       receiptNumber: receipt.receiptNumber,
+      state: orderState,
       totalCents: receipt.totalCents,
+      paidCents,
+      outstandingCents: receipt.totalCents - paidCents,
       changeCents: receipt.changeCents,
       items,
       payments,

project/src/modules/pos/application/receive-rest-payment.ts

@@ -0,0 +1,237 @@
+import type pg from 'pg';
+import { AppError } from '../../../shared/errors.js';
+import type {
+  PosPaymentInput,
+  PosPaymentKind,
+  PosPaymentResult,
+  PosSaleResult,
+} from '../domain/pos-sale.js';
+import { validatePaymentAllocations } from './create-pos-sale.js';
+import { buildPosReceipt } from './build-pos-receipt.js';
+
+export interface ReceiveRestPaymentInput {
+  orderId: string;
+  idempotencyKey: string;
+  cashSessionId: string;
+  terminalId: string;
+  userId: string;
+  payments: PosPaymentInput[];
+}
+
+interface OrderRow {
+  id: string;
+  state: string;
+  source: string;
+  total_cents: string;
+  terminal_id: string;
+  cash_session_id: string;
+  store_id: string;
+}
+
+interface SessionRow {
+  id: string;
+  terminal_id: string;
+  store_id: string;
+  status: string;
+}
+
+/**
+ * Apply additional payments to a pending POS sale.
+ *
+ * Transitions the order to COMPLETED when the new cumulative allocation
+ * equals the order total. Each payment immediately writes reporting
+ * lines and accumulates expected cash. The order row is locked during the
+ * transaction so concurrent rest-payment attempts cannot overpay.
+ */
+export class ReceiveRestPaymentUseCase {
+  constructor(private readonly pool: pg.Pool) {}
+
+  async execute(input: ReceiveRestPaymentInput): Promise<PosSaleResult> {
+    const client = await this.pool.connect();
+    try {
+      await client.query('BEGIN');
+
+      const orderRow = await client.query<OrderRow>(
+        `SELECT id, state, source, total_cents, terminal_id, cash_session_id, store_id
+           FROM orders_orders WHERE id = $1 FOR UPDATE`,
+        [input.orderId],
+      );
+      const order = orderRow.rows[0];
+      if (!order || order.source !== 'pos') {
+        throw new AppError(404, 'POS_SALE_NOT_FOUND', 'Venta no encontrada');
+      }
+      if (order.state === 'COMPLETED') {
+        throw new AppError(409, 'POS_SALE_NOT_PENDING', 'La venta ya está completamente cobrada');
+      }
+      if (order.terminal_id !== input.terminalId || order.cash_session_id !== input.cashSessionId) {
+        throw new AppError(
+          409,
+          'POS_SALE_TERMINAL_MISMATCH',
+          'La venta pertenece a otro terminal o sesión de caja',
+        );
+      }
+      const sessionRow = await client.query<SessionRow>(
+        `SELECT id, terminal_id, store_id, status
+           FROM pos_cash_sessions WHERE id = $1 FOR UPDATE`,
+        [input.cashSessionId],
+      );
+      const session = sessionRow.rows[0];
+      if (!session) throw new AppError(404, 'SESSION_NOT_FOUND', 'Sesión de caja no encontrada');
+      if (session.status !== 'OPEN') {
+        throw new AppError(409, 'SESSION_CLOSED', 'La sesión de caja está cerrada');
+      }
+
+      const totalCents = Number(order.total_cents);
+      const paidBefore = await client.query<{ sum: string | null }>(
+        `SELECT COALESCE(SUM(amount_cents), 0)::text AS sum FROM payments_transactions
+          WHERE order_id = $1 AND status = 'succeeded'`,
+        [input.orderId],
+      );
+      const paidCentsBefore = Number(paidBefore.rows[0]?.sum ?? '0');
+      const outstandingBefore = totalCents - paidCentsBefore;
+      if (outstandingBefore <= 0) {
+        throw new AppError(409, 'POS_SALE_NOT_PENDING', 'La venta ya está completamente cobrada');
+      }
+
+      const methodsResult = await client.query<{
+        id: string;
+        code: string;
+        label: string;
+        kind: PosPaymentKind;
+      }>(
+        `SELECT id, code, label, kind
+           FROM pos_payment_methods
+          WHERE store_id = $1 AND active = true
+          ORDER BY sort_order, label`,
+        [session.store_id],
+      );
+      // Validate that the new payments do not overpay the outstanding balance.
+      const validated = validatePaymentAllocations(
+        outstandingBefore,
+        input.payments,
+        methodsResult.rows,
+      );
+
+      let cashAppliedCents = 0;
+      const paymentResults: PosPaymentResult[] = [];
+      for (const [index, payment] of validated.entries()) {
+        // Unique per (orderId, idempotencyKey, payment index). Rest-payments are
+        // idempotent for the same key so retries do not duplicate transactions.
+        const providerEventId = `rest-${input.orderId}-${input.idempotencyKey}-${index}`;
+        const existing = await client.query<{ id: string }>(
+          `SELECT id FROM payments_transactions WHERE provider_event_id = $1`,
+          [providerEventId],
+        );
+        let paymentId = existing.rows[0]?.id;
+        if (!paymentId) {
+          const raw = {
+            methodCode: payment.methodCode,
+            methodLabel: payment.methodLabel,
+            kind: payment.kind,
+            tenderedCents: payment.tenderedCents,
+            changeCents: payment.changeCents,
+            ...(payment.last4 ? { last4: payment.last4 } : {}),
+            restPayment: true,
+          };
+          const inserted = await client.query<{ id: string }>(
+            `INSERT INTO payments_transactions (
+               provider, provider_event_id, provider_payment_id, order_id,
+               amount_cents, currency, status, raw
+             ) VALUES ($1, $2, $3, $4, $5, 'EUR', 'succeeded', $6)
+             RETURNING id`,
+            [
+              `pos_${payment.methodCode}`,
+              providerEventId,
+              providerEventId,
+              input.orderId,
+              payment.amountCents,
+              JSON.stringify(raw),
+            ],
+          );
+          paymentId = inserted.rows[0]?.id;
+          if (!paymentId)
+            throw new AppError(500, 'PAYMENT_INSERT_FAILED', 'No se pudo registrar el pago');
+          await client.query(
+            `INSERT INTO reporting_payment_lines (
+               order_id, store_id, terminal_id, cash_session_id, payment_method_id,
+               provider, amount_cents, currency, status, provider_ref
+             ) VALUES ($1, $2, $3, $4, $5, $6, $7, 'EUR', 'payment', $8)`,
+            [
+              input.orderId,
+              session.store_id,
+              input.terminalId,
+              input.cashSessionId,
+              payment.methodId,
+              `pos_${payment.methodCode}`,
+              payment.amountCents,
+              paymentId,
+            ],
+          );
+        }
+        if (payment.kind === 'cash') cashAppliedCents += payment.amountCents;
+        paymentResults.push({ id: paymentId, ...payment });
+      }
+
+      if (cashAppliedCents > 0) {
+        await client.query(
+          `UPDATE pos_cash_sessions
+              SET expected_cash_cents = COALESCE(expected_cash_cents, opening_cash_cents) + $1,
+                  updated_at = now()
+            WHERE id = $2`,
+          [cashAppliedCents, input.cashSessionId],
+        );
+      }
+
+      const paidAfterRow = await client.query<{ sum: string | null }>(
+        `SELECT COALESCE(SUM(amount_cents), 0)::text AS sum FROM payments_transactions
+          WHERE order_id = $1 AND status = 'succeeded'`,
+        [input.orderId],
+      );
+      const paidCentsAfter = Number(paidAfterRow.rows[0]?.sum ?? '0');
+      let finalState: 'PENDING' | 'COMPLETED' = 'PENDING';
+      if (paidCentsAfter >= totalCents) {
+        finalState = 'COMPLETED';
+        await client.query(
+          `UPDATE orders_orders
+              SET state = 'COMPLETED', state_changed_at = now(), updated_at = now()
+            WHERE id = $1`,
+          [input.orderId],
+        );
+      }
+
+      const receipt = await buildPosReceipt(client, input.orderId);
+      await client.query(
+        `INSERT INTO security_audit_log (actor_id, action, target, metadata)
+         VALUES ($1, $2, $3, jsonb_build_object('paidCents', $4::int, 'totalCents', $5::int))`,
+        [
+          input.userId,
+          finalState === 'COMPLETED' ? 'pos.sale.fulfilled' : 'pos.sale.partial',
+          input.orderId,
+          paidCentsAfter,
+          totalCents,
+        ],
+      );
+      await client.query('COMMIT');
+
+      return {
+        orderId: input.orderId,
+        idempotencyKey: input.idempotencyKey,
+        receiptNumber: receipt.receiptNumber,
+        state: finalState,
+        totalCents,
+        paidCents: paidCentsAfter,
+        outstandingCents: totalCents - paidCentsAfter,
+        changeCents: paymentResults.reduce((sum, payment) => sum + payment.changeCents, 0),
+        items: [],
+        payments: paymentResults,
+        receipt,
+        createdAt: new Date(),
+      };
+    } catch (error) {
+      await client.query('ROLLBACK');
+      throw error;
+    } finally {
+      client.release();
+    }
+  }
+}

project/src/modules/pos/domain/pos-sale.ts

@@ -111,7 +111,10 @@ export interface PosSaleResult {
   orderId: string;
   idempotencyKey: string;
   receiptNumber: string;
+  state: 'PENDING' | 'COMPLETED';
   totalCents: number;
+  paidCents: number;
+  outstandingCents: number;
   changeCents: number;
   items: PosSaleLineItem[];
   payments: PosPaymentResult[];

project/src/modules/pos/index.ts

@@ -6,6 +6,7 @@ export {
   type ConfiguredPaymentMethod,
   type ValidatedPayment,
 } from './application/create-pos-sale.js';
+export { ReceiveRestPaymentUseCase } from './application/receive-rest-payment.js';
 export { buildPosReceipt } from './application/build-pos-receipt.js';
 export type {
   PosSaleInput,

project/src/modules/pos/tests/payment-allocation.test.ts

@@ -28,16 +28,27 @@ describe('POS payment allocation', () => {
     ]);
   });
 
-  it('requires applied amounts to equal the total exactly', () => {
+  it('accepts under-allocated amounts (orders may remain PENDING)', () => {
-    expectCode(
+    expect(
-      () =>
+      validatePaymentAllocations(2_000, [{ methodCode: 'card', amountCents: 1_999 }], methods),
-        validatePaymentAllocations(2_000, [{ methodCode: 'card', amountCents: 1_999 }], methods),
+    ).toEqual([
-      'POS_PAYMENT_TOTAL_MISMATCH',
+      {
-    );
+        methodId: 'card-id',
+        methodCode: 'card',
+        methodLabel: 'Tarjeta',
+        kind: 'card',
+        amountCents: 1999,
+        tenderedCents: null,
+        changeCents: 0,
+      },
+    ]);
+  });
+
+  it('rejects overpayments while still under total', () => {
     expectCode(
       () =>
         validatePaymentAllocations(2_000, [{ methodCode: 'card', amountCents: 2_001 }], methods),
-      'POS_PAYMENT_TOTAL_MISMATCH',
+      'POS_PAYMENT_OVERPAYMENT',
     );
   });
 

work/artifacts/F-188/architect.md

@@ -0,0 +1,109 @@
+# F-188 — Architecture
+
+## Decision
+
+Allow POS orders to be created **with or without full payment**. Allow appending more payments until the order is fully paid.
+
+The schema and state machine already support `PENDING` and `COMPLETED`. No new migration is required. Two additive changes:
+
+1. `validatePaymentAllocations` stops throwing `POS_PAYMENT_TOTAL_MISMATCH` when allocations are **less than** the total; it only rejects when allocations are **greater than** the total.
+2. `CreatePosSaleUseCase` persists the order with `state='PENDING'` when `allocatedCents < totalCents`, and `state='COMPLETED'` otherwise. `outstandingCents` is computed at response time.
+
+## Semantics
+
+A POS sale has:
+
+- `totalCents`: authoritative server figure.
+- `paidCents`: sum of accepted payments (`payments_transactions.amount_cents`).
+- `outstandingCents = totalCents - paidCents`.
+
+Transitions:
+
+- `PENDING` → `COMPLETED` when the next payment brings `paidCents === totalCents`.
+- `COMPLETED` is terminal from a payment-fulfillment perspective (void/refund stay in F-189).
+- `PENDING` sales keep stock decrement, reporting lines and receipt numbering on creation; nothing changes there.
+
+## API
+
+### `POST /pos/sales` (modified)
+
+Body remains compatible with F-186. New behavior:
+
+- If `payments` sums to `totalCents` → order is `COMPLETED` (existing behavior).
+- If `payments` sums to less → order is `PENDING`. `outstandingCents` returned.
+- If `payments` sums to more → rejected with `POS_PAYMENT_OVERPAYMENT` (new).
+
+Response gains:
+
+```json
+{
+  "orderId": "…",
+  "state": "PENDING" | "COMPLETED",
+  "paidCents": 800,
+  "outstandingCents": 200,
+  ...
+}
+```
+
+### `POST /pos/sales/:id/payments` (new)
+
+Body:
+
+```json
+{
+  "idempotencyKey": "rest-pay-1",
+  "cashSessionId": "uuid",
+  "terminalId": "uuid",
+  "payments": [
+    { "methodCode": "cash", "amountCents": 200, "tenderedCents": 250 }
+  ]
+}
+```
+
+Rules:
+
+- Order must be `PENDING` from the `pos` source.
+- Terminal/session must match (same `x-terminal-id` header check as `pos/sales`).
+- Each payment allocation must reference an active method of the order's store.
+- Cash-only `tenderedCents`; change is `tendered - applied`.
+- Each payment row appends to `payments_transactions` (status `succeeded`) and `reporting_payment_lines`.
+- `expected_cash_cents` increases by cash applied.
+- When `paidCents` reaches `totalCents`, the order transitions to `COMPLETED` (and writes `state_changed_at`).
+- Idempotency: the same `idempotencyKey` returns the same payment ids and order state.
+- Returns the updated receipt and computed `outstandingCents` (0 on completion).
+
+### `GET /pos/sales` (modified)
+
+`querystring` gains `state` (`PENDING` | `COMPLETED`) and `outstandingOnly` boolean. Response rows gain `state`, `paidCents`, `outstandingCents`.
+
+Errors: `POS_SALE_NOT_FOUND` (404), `POS_SALE_NOT_PENDING` (409), `POS_PAYMENT_OVERPAYMENT` (400).
+
+## Race safety
+
+A single transition wraps `payments_transactions` inserts + `reporting_payment_lines` inserts + `pos_cash_sessions` update + `orders_orders` update in one transaction with `SELECT ... FOR UPDATE` on the target order. Allocation cap is enforced server-side via sum(paidCents) so concurrent rest-payments cannot overpay.
+
+## Reporting
+
+Every payment — initial or rest — emits `reporting_payment_lines` with `payment_method_id`, `terminal_id`, `cash_session_id`, `store_id`. `reporting_payment_lines` already supports multiple rows per order (verified in F-145).
+
+`expected_cash_cents` accumulates only the **applied** cash, never the tendered. Cash-only `tenderedCents` still informs the cashier UI change.
+
+## POS cashier UI
+
+- The "Cerrar ticket" button label flips to **Cobrar e imprimir** or **Guardar pendiente** depending on whether allocations cover the total.
+- A new **Pendientes** panel in the terminal sidebar shows `PENDING` POS sales for the same `storeId`, with their outstanding balance and an **Aplicar cobro** action that reopens the sale in checkout with its remaining balance prefilled.
+- After rest payment completes the order, the cashier modal reuses the existing receipt flow (print / email / reset).
+
+Admin and reporting updates are tracked separately in F-190.
+
+## Tests
+
+Integration coverage:
+
+1. Create POS order with partial payment → `PENDING` and `outstandingCents`.
+2. Rest payment that covers → transitions to `COMPLETED`.
+3. Overpayment rejected at creation and at rest-payment.
+4. Rest payment on a `COMPLETED` order rejected with `POS_SALE_NOT_PENDING`.
+5. Replaying the same `idempotencyKey` does not duplicate payments or rows.
+6. Reporting lines and expected_cash accumulate correctly across installments.
+7. Backend typecheck/build, POS typecheck/build, verify.sh.

work/artifacts/F-188/implementer.md

@@ -0,0 +1,33 @@
+# F-188 — Implementer evidence
+
+## Delivered
+
+- Backend: `validatePaymentAllocations` accepts under-allocated amounts and rejects only overpayments (`POS_PAYMENT_OVERPAYMENT`, replacing `POS_PAYMENT_TOTAL_MISMATCH`).
+- Backend: `CreatePosSaleUseCase` now inserts POS orders with `state='PENDING'` then transitions to `'COMPLETED'` when the initial allocations equal the total. Response gains `state`, `paidCents`, `outstandingCents`.
+- Backend: `ReceiveRestPaymentUseCase` (new) accepts rest payments against a `PENDING` order. Locks the order, validates that the new payments do not overpay the outstanding balance, writes `payments_transactions` + `reporting_payment_lines`, accumulates `expected_cash_cents`, transitions to `COMPLETED` when fully paid, and emits `pos.sale.partial` / `pos.sale.fulfilled` audit events. Idempotency-keyed retries do not duplicate transactions.
+- Backend: new `POST /pos/sales/:id/payments` endpoint enforces terminal/session binding via `x-terminal-id` and POS roles.
+- Backend: `GET /pos/sales` extended with `state` and `storeId` filters and exposes `state`, `paidCents`, `outstandingCents` per row.
+- Backend: `PosSaleResult` domain type exposes `state`, `paidCents`, `outstandingCents`.
+- POS cashier UI: confirmation button label flips between **Cobrar e imprimir** and **Guardar pendiente**, alongside a **Vaciar caja** button.
+- POS cashier UI: new left panel **Pendientes de caja** lists `PENDING` POS sales for the active session with **Cobrar resto** actions. A reusable `PaymentModal` repurposes the cashier payment modal for the rest payment.
+- POS cashier UI: closing the rest payment cycle to `COMPLETED` opens the receipt modal just like a fully paid sale.
+- Tests: real PostgreSQL `pos-pending-payments.itest.ts` (5 tests) covers creation as `PENDING`, completion via rest-payment, overpayment rejection, list filtering and idempotency. Updated payment-allocation unit test (4 tests).
+
+## Validation
+
+- Backend, POS, admin typecheck: PASS.
+- Backend, POS, admin production build: PASS.
+- Real-PostgreSQL sequential suite: 360/360 PASS across 80 files.
+- Backend unit tests after update: 268/268 PASS.
+- POS unit tests + new integration: 5/5 PASS.
+- F-186 POS checkout integration: 1/1 PASS (still passes; type now reflects `state: 'COMPLETED'`).
+- Migration cycle: 4/4 PASS.
+- Migration 055 (F-187 cashier lifecycle) remains unchanged; no new migration is required for F-188 because the schema already supports `PENDING`/`COMPLETED`.
+- Targeted ESLint + Prettier on every changed file: PASS.
+- `./scripts/verify.sh`: PASS.
+
+## Baselines
+
+- Global backend lint retains nine unrelated pre-existing errors; F-188 introduces none.
+- Boundary check retained the unrelated security-module logging import; F-188 changes run in the POS module and respect boundaries.
+- Untracked upload JPGs stay excluded from the feature commit.

work/artifacts/F-188/leader-close.json

@@ -0,0 +1 @@
+{"feature_id":"F-188","agent":"leader","stage":"close","verdict":"APPROVED","checks":[{"item":"All gates APPROVED","ok":true},{"item":"360/360 PostgreSQL sequential tests","ok":true},{"item":"Typecheck and production builds (backend, admin, POS)","ok":true},{"item":"Documentation updated (POS_CHECKOUT)","ok":true}],"issues":[]}

work/artifacts/F-188/qa.json

@@ -0,0 +1 @@
+{"feature_id":"F-188","agent":"qa","stage":"qa_gate","verdict":"APPROVED","acceptance":[{"id":1,"criterion":"Partial allocation creates PENDING sale with outstandingCents","ok":true},{"id":2,"criterion":"Fully paid sale remains COMPLETED","ok":true},{"id":3,"criterion":"Rest-payment endpoint brings PENDING to COMPLETED atomically","ok":true},{"id":4,"criterion":"Overpayment rejected at creation and at rest-payment","ok":true},{"id":5,"criterion":"Reporting lines accumulate across installments","ok":true},{"item":"","ok":true},{"id":6,"criterion":"Cash-session expected_cash_cents increases by applied cash","ok":true},{"id":7,"criterion":"Pending sales visible in cashier with Cobrar resto action","ok":true},{"id":8,"criterion":"Idempotency-keyed retries do not duplicate rows","ok":true},{"id":9,"criterion":"Regression: 360/360 real PostgreSQL tests; typecheck/builds/verify green","ok":true}],"issues":[]}

work/artifacts/F-188/reviewer.json

@@ -0,0 +1 @@
+{"feature_id":"F-188","agent":"reviewer","stage":"review_gate","verdict":"APPROVED","checks":[{"item":"validatePaymentAllocations allows under-allocated amounts","ok":true},{"item":"CreatePosSaleUseCase persists PENDING then transitions to COMPLETED","ok":true},{"item":"ReceiveRestPaymentUseCase locks the order and accumulates reporting","ok":true},{"item":"POST /pos/sales/:id/payments enforces terminal binding and POS roles","ok":true},{"item":"GET /pos/sales exposes state and outstandingCents with filters","ok":true},{"item":"Idempotent retries do not duplicate transactions","ok":true},{"item":"POS UI flips confirmation label and exposes pending panel","ok":true},{"item":"Rest payment completes the receipt flow on COMPLETED","ok":true},{"item":"360/360 real PostgreSQL tests pass","ok":true}],"issues":[]}

work/artifacts/F-188/security.json

@@ -0,0 +1 @@
+{"feature_id":"F-188","agent":"security","stage":"security_gate","verdict":"APPROVED","checks":[{"item":"All new endpoints restrict to pos_cashier/pos_manager/admin","ok":true},{"item":"Terminal binding x-terminal-id enforced on rest-payment","ok":true},{"item":"Cash-session open status validated before applying payments","ok":true},{"item":"Order row is locked and overpayment is rejected server-side","ok":true},{"item":"Reporting and audit events emitted in same transaction","ok":true},{"item":"Secret/secret-scan: clean","ok":true},{"item":"Backend dependency audit: clean","ok":true}],"issues":[]}

work/current.md

@@ -1,31 +1,30 @@
-# F-187 — Admin can deactivate and delete POS cashiers
+# F-188 — POS pending payment orders and completion states
 
-Allow administrators to safely remove cashier access without breaking historical POS attribution.
+Allow POS orders to be saved with an outstanding balance, ensure fully paid POS orders reach `COMPLETED`, and let cashiers apply later payments to clear the outstanding balance.
 
 ## Scope
-- Add an explicit active/deactivated/deleted lifecycle for backoffice POS cashier accounts.
+
-- Show POS cashiers and their status in the TPV administration page.
+- Backend `validatePaymentAllocations` accepts partial allocations (sum < total) without throwing `POS_PAYMENT_TOTAL_MISMATCH`. Overpayment remains rejected.
-- Let admins create cashiers, deactivate/reactivate them, and delete them with explicit confirmation.
+- `POST /pos/sales` persists orders with `state='PENDING'` when allocated total < order total, and `state='COMPLETED'` when allocations cover the order total.
-- Treat delete as an irreversible soft deletion: preserve the backoffice user row and its ID so sessions, sales, receipts, reporting and audit history keep their cashier attribution.
+- New `POST /pos/sales/:id/payments` endpoint appends payments to a `PENDING` POS sale. When allocations now equal the order total, the order transitions to `COMPLETED` atomically.
-- Revoke every live backoffice session when a cashier is deactivated or deleted.
+- Stock, reporting lines, payment lines and expected cash balance are updated by every payment, including rest-payment installments.
-- Reject login and existing-session authentication for inactive or deleted accounts.
+- Sale list exposes `state`, `paidCents` and `outstandingCents`. Cashier can fetch `PENDING` POS sales for the current session.
-- Reject deactivation/deletion while the cashier owns an open cash session; require the cash session to be closed first.
+- POS cashier UI offers "Save as pending" when allocations do not cover the total; lists pending sales in the cashier and provides a "Receive rest payment" action that reopens the cash session sale with its current outstanding balance.
-- Keep all lifecycle mutations admin-only and cashier-role-only.
+- Audit log records partial creation and pending fulfillment transitions.
+- `bounded shipments` and refunds remain out of scope (F-189).
 
 ## Out of scope
-- Removing or changing administrators, editors or POS managers.
+- Refunds, partial refunds and return tickets (F-189).
-- Reassigning historical sales or cash sessions to another cashier.
+- Daily close reconciliation on top of pending balances (F-191).
-- Forcing or automating cash-session closure.
+- Customer credit, deposit or deposit-paper workflows.
-- Bulk cashier operations.
 
 ## Acceptance
-1. Admin TPV lists POS cashiers with active, inactive or deleted status.
+1. Backend accepts partial payments on a POS sale and persists the order with `PENDING` and `outstandingCents = total - paid`.
-2. Admin can create a cashier and the account is active by default.
+2. Backend still marks fully paid POS orders as `COMPLETED` and rejects overpayment.
-3. Admin can deactivate an active cashier and reactivate an inactive non-deleted cashier.
+3. Pending POS sales appear in the cashier's session list with the outstanding balance.
-4. Deactivation immediately revokes existing sessions and blocks future login/authentication.
+4. Cashier can apply a follow-up payment to a `PENDING` sale; reaching the total transitions it to `COMPLETED` atomically.
-5. Admin can delete a cashier only after explicit confirmation; deleted cashiers cannot be reactivated or authenticate.
+5. Stock is reserved on POS sale creation (not on full payment) and reporting captures every partial payment.
-6. Deactivation or deletion is rejected while the cashier has an open cash session.
+6. Replaying the same idempotency key keeps the original order, its state and its payments intact.
-7. Deletion preserves the cashier row/ID and all historical session, sale, receipt and reporting attribution.
+7. Non-admin/non-POS users cannot create or modify pending POS sales.
-8. Non-admin users cannot list or mutate cashier lifecycle, and non-cashier roles cannot be targeted.
+8. Migration is reversible (or no migration is needed) and existing fully paid sales stay `COMPLETED`.
-9. Migration is reversible and existing backoffice accounts remain active.
+9. Tests, typecheck, affected builds and `verify.sh` are green.
-10. Tests, typecheck, affected builds and `verify.sh` are green.

work/history.md

@@ -512,3 +512,10 @@
 ## F-195 cerrada (2026-08-22) — Hide IVA/Audit/Logs from main sidebar
 - Gates: reviewer APPROVED, security APPROVED, qa APPROVED, verify.sh exit 0.
 - Fix: removed IVA/Auditoría/Logs from NAV_ITEMS so they no longer appear in main sidebar; routes still accessible via in-page links from /settings.
+
+## F-188 cerrada (2026-08-22) — POS pending payment orders and completion states
+- Gates: reviewer APPROVED, security APPROVED, qa APPROVED, verify.sh exit 0.
+- Backend: ventas POS permiten pagos parciales (state=PENDING) y transitan a COMPLETED al cubrir el total. Nuevo endpoint POST /pos/sales/:id/payments con idempotencia y cobro atómico del resto.
+- Backend: validatePaymentAllocations acepta under-allocation y rechaza overpayments; reporting, payments_transactions y expected_cash_cents acumulan en cada pago.
+- POS UI: botón "Cobrar e imprimir / Guardar pendiente", panel lateral de pendientes con acción "Cobrar resto" y modal reutilizando PaymentModal.
+- Evidencia: 360/360 tests con PostgreSQL real en secuencia, builds backend/POS/admin verdes; `work/artifacts/F-188/`.

work/runtime-status.json

@@ -6,6 +6,6 @@
   "state": "waiting",
   "next_agent": "leader",
   "waiting_for": "Seleccionar una feature pending y actualizar este estado",
-  "updated_at": "2026-08-22T20:36:05Z",
+  "updated_at": "2026-08-22T20:44:37Z",
   "timeline": []
 }