diff --git a/docs/ADMIN.md b/docs/ADMIN.md
index 4fa923d..e33adbe 100644
--- a/docs/ADMIN.md
+++ b/docs/ADMIN.md
@@ -314,6 +314,27 @@ container/facade/service split as the rest of `admin/*`:
 - Wired into `/​:lang/backoffice/orders` and `/​:lang/backoffice/orders/:id`,
   replacing the coming-soon placeholder.
 
+## Sprint 24 - Transactions (mock/local)
+
+`features/admin/transactions/`. `AdminTransactionsLocalGateway` derives its
+mock data from `AdminOrdersLocalGateway`'s 24 seeded orders (one
+transaction per order, deterministic type/status/method assignment) rather
+than a separate synthetic dataset - keeps order numbers/totals consistent
+between the two mock feature areas.
+
+- List: search, status filter, type filter (payment/refund/qr_payment),
+  pagination, CSV export.
+- Retry failed transactions (`status: 'failed' -> 'retried'`, appends an
+  audit entry).
+- Fraud flag toggle per transaction.
+- Audit log: each transaction carries its own `audit: AdminTransactionAuditEntry[]`
+  (creation, retries, fraud-flag changes), viewed via a dialog - this is a
+  per-transaction audit trail, not the system-wide audit/security log
+  planned for Sprint 26 (Monitoring); the two are intentionally separate
+  scopes.
+- Wired into `/​:lang/backoffice/transactions`, replacing the coming-soon
+  placeholder.
+
 ## Known gaps / backend needs
 
 - **Dashboard metrics endpoint.** Categories/Products counts are computed
diff --git a/docs/BACKEND.md b/docs/BACKEND.md
index 8781d64..b922d8a 100644
--- a/docs/BACKEND.md
+++ b/docs/BACKEND.md
@@ -144,6 +144,14 @@ Plus, if authenticated history/wishlist/compare/saved-searches sync is wanted: `
 
 ---
 
+## 13. Transactions (Sprint 24, mock/local)
+
+**Current behavior:** `features/admin/transactions/` exists (list, retry-failed, fraud flag, per-transaction audit log, CSV export) against `AdminTransactionsLocalGateway`, which derives one synthetic transaction per seeded mock order from item 7's `AdminOrdersLocalGateway` — no real payment/transaction data exists.
+
+**Needed:** a real payments/transactions domain (card, QR, cash-on-delivery), linked to orders, with retry semantics matching whatever the actual payment provider supports, and fraud-flag persistence.
+
+**Frontend files:** implement `AdminTransactionsApiGateway` against `AdminTransactionsGateway` (`services/admin-transactions-gateway.interface.ts`) and rebind via an injection token.
+
 ## Known reliability issues
 
 ### Production 502/504 Bad Gateway on refresh / back-navigation
diff --git a/docs/SPRINT-PLAN.md b/docs/SPRINT-PLAN.md
index d979b32..2d271c6 100644
--- a/docs/SPRINT-PLAN.md
+++ b/docs/SPRINT-PLAN.md
@@ -47,8 +47,9 @@ Notify user: **from Sprint 20 (Categories) once product↔category link + admin
 - [x] `docs/ADMIN.md` (new Sprint 23 section), `docs/BACKEND.md` item 7 rewritten
 - Commit: `feat(admin): order management`
 
-## Sprint 24 — Transactions (mock/local)
-- [ ] Payments/refunds/QR list, status, history, export, filters, search, retry, fraud flags, audit log view
+## Sprint 24 — Transactions (mock/local) ✅ done
+- [x] Payments/refunds/QR list, status, history (derived from Sprint 23's seeded orders), export, filters, search, retry failed, fraud flags, per-transaction audit log dialog
+- [x] `docs/ADMIN.md` (new Sprint 24 section), `docs/BACKEND.md` item 13 added
 - Commit: `feat(admin): transaction management`
 
 ## Sprint 25 — Users & Roles
diff --git a/src/app/app.routes.ts b/src/app/app.routes.ts
index dace8b1..6737af8 100644
--- a/src/app/app.routes.ts
+++ b/src/app/app.routes.ts
@@ -93,8 +93,7 @@ const coreRoutes: Routes = [
       },
       {
         path: 'transactions',
-        loadComponent: () => import('./features/backoffice/shared/backoffice-coming-soon-page.component').then(m => m.BackofficeComingSoonPageComponent),
-        data: { titleKey: 'dashboard.actionTransactions' }
+        loadComponent: () => import('./features/admin/transactions/pages/admin-transactions-list-page.component').then(m => m.AdminTransactionsListPageComponent)
       },
       {
         path: 'orders',
diff --git a/src/app/features/admin/transactions/facade/admin-transactions.facade.ts b/src/app/features/admin/transactions/facade/admin-transactions.facade.ts
new file mode 100644
index 0000000..038689f
--- /dev/null
+++ b/src/app/features/admin/transactions/facade/admin-transactions.facade.ts
@@ -0,0 +1,51 @@
+import { Injectable, inject, signal } from '@angular/core';
+import { take } from 'rxjs/operators';
+import { AdminTransaction, AdminTransactionListFilters } from '../models/admin-transaction.model';
+import { AdminTransactionsLocalGateway } from '../services/admin-transactions-local.gateway';
+
+@Injectable({ providedIn: 'root' })
+export class AdminTransactionsFacade {
+  private readonly gateway = inject(AdminTransactionsLocalGateway);
+
+  readonly filters = signal<AdminTransactionListFilters>({ search: '', status: 'all', type: 'all', page: 1, pageSize: 10 });
+  readonly transactions = signal<AdminTransaction[]>([]);
+  readonly total = signal(0);
+  readonly loading = signal(false);
+
+  loadList(): void {
+    this.loading.set(true);
+    this.gateway.loadTransactions(this.filters()).pipe(take(1)).subscribe({
+      next: result => {
+        this.transactions.set(result.items);
+        this.total.set(result.total);
+        this.loading.set(false);
+      },
+      error: () => {
+        this.transactions.set([]);
+        this.total.set(0);
+        this.loading.set(false);
+      }
+    });
+  }
+
+  updateFilters(patch: Partial<AdminTransactionListFilters>): void {
+    this.filters.update(current => ({ ...current, ...patch, page: patch.page ?? 1 }));
+    this.loadList();
+  }
+
+  retryFailed(id: string): void {
+    this.gateway.retryFailed(id).pipe(take(1)).subscribe({ next: () => this.loadList() });
+  }
+
+  toggleFraudFlag(id: string, flagged: boolean): void {
+    this.gateway.setFraudFlag(id, flagged).pipe(take(1)).subscribe({ next: () => this.loadList() });
+  }
+
+  exportCsv(): string {
+    const header = 'Order Number,Type,Method,Status,Amount,Currency,Fraud Flag,Created At';
+    const rows = this.transactions().map(tx =>
+      [tx.orderNumber, tx.type, tx.method, tx.status, tx.amount, tx.currency, tx.fraudFlag, tx.createdAt].join(',')
+    );
+    return [header, ...rows].join('\n');
+  }
+}
diff --git a/src/app/features/admin/transactions/models/admin-transaction.model.ts b/src/app/features/admin/transactions/models/admin-transaction.model.ts
new file mode 100644
index 0000000..1031b35
--- /dev/null
+++ b/src/app/features/admin/transactions/models/admin-transaction.model.ts
@@ -0,0 +1,38 @@
+export type AdminTransactionType = 'payment' | 'refund' | 'qr_payment';
+export type AdminTransactionStatus = 'pending' | 'success' | 'failed' | 'retried';
+
+export interface AdminTransactionAuditEntry {
+  action: string;
+  actor: string;
+  timestamp: string;
+}
+
+export interface AdminTransaction {
+  id: string;
+  orderId: string;
+  orderNumber: string;
+  type: AdminTransactionType;
+  method: string;
+  status: AdminTransactionStatus;
+  amount: number;
+  currency: string;
+  fraudFlag: boolean;
+  audit: AdminTransactionAuditEntry[];
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface AdminTransactionListFilters {
+  search: string;
+  status: 'all' | AdminTransactionStatus;
+  type: 'all' | AdminTransactionType;
+  page: number;
+  pageSize: number;
+}
+
+export interface AdminTransactionsListResult {
+  items: AdminTransaction[];
+  total: number;
+  page: number;
+  pageSize: number;
+}
diff --git a/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.html b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.html
new file mode 100644
index 0000000..31f0481
--- /dev/null
+++ b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.html
@@ -0,0 +1,72 @@
+<section class="admin-transactions-card">
+  <div class="toolbar">
+    <div class="filters">
+      <app-input type="search" [ngModel]="facade.filters().search" (ngModelChange)="facade.updateFilters({ search: $event })" [placeholder]="'adminTransactions.search' | translate" />
+      <select [ngModel]="facade.filters().status" (ngModelChange)="facade.updateFilters({ status: $event })">
+        @for (status of statuses; track status) {
+          <option [value]="status">{{ ('adminTransactions.status.' + status) | translate }}</option>
+        }
+      </select>
+      <select [ngModel]="facade.filters().type" (ngModelChange)="facade.updateFilters({ type: $event })">
+        @for (type of types; track type) {
+          <option [value]="type">{{ ('adminTransactions.type.' + type) | translate }}</option>
+        }
+      </select>
+    </div>
+    <app-button variant="secondary" (click)="exportCsv()">{{ 'adminOrders.export' | translate }}</app-button>
+  </div>
+
+  @if (!facade.loading() && facade.transactions().length === 0) {
+    <app-empty-state [title]="'adminTransactions.emptyTitle' | translate" [description]="'adminTransactions.emptyDescription' | translate" />
+  } @else {
+    <app-table>
+      <thead>
+        <tr>
+          <th>{{ 'adminOrders.orderNumber' | translate }}</th>
+          <th>{{ 'adminTransactions.type' | translate }}</th>
+          <th>{{ 'adminTransactions.method' | translate }}</th>
+          <th>{{ 'backoffice.status' | translate }}</th>
+          <th>{{ 'backoffice.price' | translate }}</th>
+          <th>{{ 'adminTransactions.fraud' | translate }}</th>
+          <th>{{ 'adminProducts.actions' | translate }}</th>
+        </tr>
+      </thead>
+      <tbody>
+        @for (tx of facade.transactions(); track tx.id) {
+          <tr>
+            <td>{{ tx.orderNumber }}</td>
+            <td>{{ ('adminTransactions.type.' + tx.type) | translate }}</td>
+            <td>{{ tx.method }}</td>
+            <td><app-badge [variant]="tx.status === 'success' ? 'success' : tx.status === 'failed' ? 'danger' : 'neutral'">{{ ('adminTransactions.status.' + tx.status) | translate }}</app-badge></td>
+            <td>{{ tx.amount }} {{ tx.currency }}</td>
+            <td>
+              @if (tx.fraudFlag) {
+                <app-badge variant="danger">{{ 'adminTransactions.flagged' | translate }}</app-badge>
+              }
+            </td>
+            <td class="actions">
+              @if (tx.status === 'failed') {
+                <app-button variant="secondary" size="sm" (click)="facade.retryFailed(tx.id)">{{ 'adminTransactions.retry' | translate }}</app-button>
+              }
+              <app-button variant="secondary" size="sm" (click)="facade.toggleFraudFlag(tx.id, !tx.fraudFlag)">{{ (tx.fraudFlag ? 'adminTransactions.clearFlag' : 'adminTransactions.flag') | translate }}</app-button>
+              <app-button variant="secondary" size="sm" (click)="viewAudit(tx)">{{ 'adminTransactions.audit' | translate }}</app-button>
+            </td>
+          </tr>
+        }
+      </tbody>
+    </app-table>
+
+    <div class="pager">
+      <span>{{ facade.total() }} {{ 'adminProducts.items' | translate }}</span>
+      <app-pagination [currentPage]="facade.filters().page" [totalPages]="totalPages()" (pageChange)="facade.updateFilters({ page: $event })" />
+    </div>
+  }
+
+  <app-dialog [open]="!!auditTarget()" [titleText]="'adminTransactions.audit' | translate" size="sm" (closed)="closeAudit()">
+    @if (auditTarget(); as tx) {
+      @for (entry of tx.audit; track $index) {
+        <p>{{ entry.timestamp | date:'short' }} — {{ entry.actor }} — {{ entry.action }}</p>
+      }
+    }
+  </app-dialog>
+</section>
diff --git a/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.scss b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.scss
new file mode 100644
index 0000000..418b67f
--- /dev/null
+++ b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.scss
@@ -0,0 +1,7 @@
+.admin-transactions-card { display: grid; gap: 16px; padding: 16px; border: 1px solid var(--border-color, #d3dad9); border-radius: 16px; background: #fff; }
+.toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: flex-start; }
+.filters { display: flex; flex-wrap: wrap; gap: 10px; flex: 1; }
+select { min-height: 40px; padding: 0 10px; border: 1px solid var(--border-color, #d3dad9); border-radius: 10px; }
+.pager { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
+.actions { display: flex; gap: 8px; flex-wrap: wrap; }
+@media (max-width: 640px) { .filters { flex-direction: column; align-items: stretch; } }
diff --git a/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.ts b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.ts
new file mode 100644
index 0000000..16696a5
--- /dev/null
+++ b/src/app/features/admin/transactions/pages/admin-transactions-list-page.component.ts
@@ -0,0 +1,56 @@
+import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { FormsModule } from '@angular/forms';
+import { AdminTransactionsFacade } from '../facade/admin-transactions.facade';
+import { AdminTransaction } from '../models/admin-transaction.model';
+import { TranslatePipe } from '../../../../i18n/translate.pipe';
+import { ButtonComponent } from '../../../../shared/ui/button/button.component';
+import { InputComponent } from '../../../../shared/ui/input/input.component';
+import { BadgeComponent } from '../../../../shared/ui/badge/badge.component';
+import { TableComponent } from '../../../../shared/ui/table/table.component';
+import { PaginationComponent } from '../../../../shared/ui/pagination/pagination.component';
+import { EmptyStateComponent } from '../../../../shared/ui/empty-state/empty-state.component';
+import { DialogComponent } from '../../../../shared/ui/dialog/dialog.component';
+
+@Component({
+  selector: 'app-admin-transactions-list-page',
+  standalone: true,
+  imports: [CommonModule, FormsModule, TranslatePipe, ButtonComponent, InputComponent, BadgeComponent, TableComponent, PaginationComponent, EmptyStateComponent, DialogComponent],
+  templateUrl: './admin-transactions-list-page.component.html',
+  styleUrls: ['./admin-transactions-list-page.component.scss'],
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class AdminTransactionsListPageComponent {
+  readonly facade = inject(AdminTransactionsFacade);
+
+  readonly statuses = ['all', 'pending', 'success', 'failed', 'retried'] as const;
+  readonly types = ['all', 'payment', 'refund', 'qr_payment'] as const;
+  readonly auditTarget = signal<AdminTransaction | null>(null);
+
+  constructor() {
+    this.facade.loadList();
+  }
+
+  totalPages(): number {
+    return Math.max(1, Math.ceil(this.facade.total() / this.facade.filters().pageSize));
+  }
+
+  viewAudit(tx: AdminTransaction): void {
+    this.auditTarget.set(tx);
+  }
+
+  closeAudit(): void {
+    this.auditTarget.set(null);
+  }
+
+  exportCsv(): void {
+    const csv = this.facade.exportCsv();
+    const blob = new Blob([csv], { type: 'text/csv' });
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement('a');
+    link.href = url;
+    link.download = 'transactions.csv';
+    link.click();
+    URL.revokeObjectURL(url);
+  }
+}
diff --git a/src/app/features/admin/transactions/services/admin-transactions-gateway.interface.ts b/src/app/features/admin/transactions/services/admin-transactions-gateway.interface.ts
new file mode 100644
index 0000000..86bbef3
--- /dev/null
+++ b/src/app/features/admin/transactions/services/admin-transactions-gateway.interface.ts
@@ -0,0 +1,8 @@
+import { Observable } from 'rxjs';
+import { AdminTransaction, AdminTransactionListFilters, AdminTransactionsListResult } from '../models/admin-transaction.model';
+
+export interface AdminTransactionsGateway {
+  loadTransactions(filters: AdminTransactionListFilters): Observable<AdminTransactionsListResult>;
+  retryFailed(id: string): Observable<AdminTransaction | null>;
+  setFraudFlag(id: string, flagged: boolean): Observable<AdminTransaction | null>;
+}
diff --git a/src/app/features/admin/transactions/services/admin-transactions-local.gateway.ts b/src/app/features/admin/transactions/services/admin-transactions-local.gateway.ts
new file mode 100644
index 0000000..ba00a3f
--- /dev/null
+++ b/src/app/features/admin/transactions/services/admin-transactions-local.gateway.ts
@@ -0,0 +1,91 @@
+import { Injectable } from '@angular/core';
+import { Observable, of } from 'rxjs';
+import { delay } from 'rxjs/operators';
+import { AdminTransaction, AdminTransactionListFilters, AdminTransactionsListResult } from '../models/admin-transaction.model';
+import { AdminTransactionsGateway } from './admin-transactions-gateway.interface';
+import { AdminOrdersLocalGateway } from '../../orders/services/admin-orders-local.gateway';
+
+const METHODS = ['card', 'qr', 'cash_on_delivery'];
+
+@Injectable({ providedIn: 'root' })
+export class AdminTransactionsLocalGateway implements AdminTransactionsGateway {
+  private cache: AdminTransaction[] | null = null;
+
+  constructor(private readonly ordersGateway: AdminOrdersLocalGateway) {}
+
+  loadTransactions(filters: AdminTransactionListFilters): Observable<AdminTransactionsListResult> {
+    return new Observable<AdminTransactionsListResult>(subscriber => {
+      this.ensureData().then(() => {
+        const filtered = (this.cache ?? [])
+          .filter(tx => !filters.search || `${tx.orderNumber} ${tx.method}`.toLowerCase().includes(filters.search.toLowerCase()))
+          .filter(tx => filters.status === 'all' || tx.status === filters.status)
+          .filter(tx => filters.type === 'all' || tx.type === filters.type)
+          .sort((left, right) => right.createdAt.localeCompare(left.createdAt));
+        const start = (filters.page - 1) * filters.pageSize;
+        subscriber.next({
+          items: filtered.slice(start, start + filters.pageSize),
+          total: filtered.length,
+          page: filters.page,
+          pageSize: filters.pageSize,
+        });
+        subscriber.complete();
+      });
+    }).pipe(delay(50));
+  }
+
+  retryFailed(id: string): Observable<AdminTransaction | null> {
+    return this.mutate(id, tx => ({
+      ...tx,
+      status: 'retried',
+      updatedAt: new Date().toISOString(),
+      audit: [...tx.audit, { action: 'Retried failed transaction', actor: 'admin', timestamp: new Date().toISOString() }],
+    }));
+  }
+
+  setFraudFlag(id: string, flagged: boolean): Observable<AdminTransaction | null> {
+    return this.mutate(id, tx => ({
+      ...tx,
+      fraudFlag: flagged,
+      updatedAt: new Date().toISOString(),
+      audit: [...tx.audit, { action: flagged ? 'Flagged as fraud' : 'Fraud flag cleared', actor: 'admin', timestamp: new Date().toISOString() }],
+    }));
+  }
+
+  private mutate(id: string, update: (tx: AdminTransaction) => AdminTransaction): Observable<AdminTransaction | null> {
+    const existing = (this.cache ?? []).find(tx => tx.id === id);
+    if (!existing) {
+      return of(null);
+    }
+    const updated = update(existing);
+    this.cache = (this.cache ?? []).map(tx => tx.id === id ? updated : tx);
+    return of(updated).pipe(delay(50));
+  }
+
+  private async ensureData(): Promise<void> {
+    if (this.cache) {
+      return;
+    }
+    const orders = await new Promise<{ id: string; orderNumber: string; total: number; currency: string; status: string; createdAt: string }[]>(resolve =>
+      this.ordersGateway.loadOrders({ search: '', status: 'all', page: 1, pageSize: 1000 }).subscribe(result => resolve(result.items))
+    );
+    this.cache = orders.map((order, index) => this.seedTransaction(order, index));
+  }
+
+  private seedTransaction(order: { id: string; orderNumber: string; total: number; currency: string; status: string; createdAt: string }, index: number): AdminTransaction {
+    const status = order.status === 'cancelled' ? 'failed' : order.status === 'refunded' ? 'success' : index % 7 === 0 ? 'pending' : 'success';
+    return {
+      id: `tx-${index + 1}`,
+      orderId: order.id,
+      orderNumber: order.orderNumber,
+      type: order.status === 'refunded' ? 'refund' : index % 3 === 0 ? 'qr_payment' : 'payment',
+      method: METHODS[index % METHODS.length],
+      status,
+      amount: order.total,
+      currency: order.currency,
+      fraudFlag: index % 11 === 0,
+      audit: [{ action: 'Transaction created', actor: 'system', timestamp: order.createdAt }],
+      createdAt: order.createdAt,
+      updatedAt: order.createdAt,
+    };
+  }
+}