feat(POS-FIX-7): completed feature

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

@@ -1336,7 +1336,7 @@ export async function registerPosRoutes(app: FastifyInstance, deps: PosRouteDeps
             cashSessionId: { type: 'string', format: 'uuid' },
             terminalId: { type: 'string', format: 'uuid' },
             items: { type: 'array', minItems: 1, items: { type: 'object' } },
-            payments: { type: 'array', minItems: 1, items: { type: 'object' } },
+            payments: { type: 'array', minItems: 0, items: { type: 'object' } },
             customerId: { type: 'string', format: 'uuid' },
           },
         },
@@ -1387,7 +1387,7 @@ export async function registerPosRoutes(app: FastifyInstance, deps: PosRouteDeps
           cashSessionId: z.string().uuid(),
           terminalId: z.string().uuid(),
           items: z.array(z.union([freeLine, stockLine])).min(1),
-          payments: z.array(payment).min(1),
+          payments: z.array(payment).min(0),
           customerId: z.string().uuid().optional(),
         }),
         request.body ?? {},

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

@@ -51,8 +51,9 @@ export function validatePaymentAllocations(
   inputs: PosPaymentInput[],
   methods: ConfiguredPaymentMethod[],
 ): ValidatedPayment[] {
+  // Zero payments are allowed — creates a parked/pending sale with full outstanding balance.
   if (inputs.length === 0) {
-    throw new AppError(400, 'POS_PAYMENT_REQUIRED', 'Selecciona al menos una forma de pago');
+    return [];
   }
   const byCode = new Map(methods.map((method) => [method.code, method]));
   const validated = inputs.map((input) => {