feat(POS-008): completed feature

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

@@ -0,0 +1,48 @@
+export interface PosSaleLineItem {
+  variantId: string;
+  productId: string;
+  sku: string;
+  ean: string | null;
+  name: string;
+  unitPriceCents: number;
+  discountCents: number;
+  taxCents: number;
+  quantity: number;
+}
+
+export type PosPaymentKind = 'cash' | 'card' | 'other';
+
+export interface PosPaymentInput {
+  kind: PosPaymentKind;
+  amountCents: number;
+  /** For cash payments: actual amount given by customer. */
+  tenderedCents?: number;
+  /** For card: last 4 digits if known. */
+  last4?: string;
+}
+
+export interface PosSaleInput {
+  idempotencyKey: string;
+  cashSessionId: string;
+  terminalId: string;
+  userId: string;
+  items: PosSaleLineItem[];
+  payments: PosPaymentInput[];
+  /** Optional customer ID for loyalty. */
+  customerId?: string;
+}
+
+export interface PosSaleResult {
+  orderId: string;
+  idempotencyKey: string;
+  totalCents: number;
+  items: PosSaleLineItem[];
+  payments: PosPaymentResult[];
+  createdAt: Date;
+}
+
+export interface PosPaymentResult {
+  id: string;
+  kind: PosPaymentKind;
+  amountCents: number;
+}