diff --git a/frontend/src/app/pages/check-in-placeholder-page.component.ts b/frontend/src/app/pages/check-in-placeholder-page.component.ts
index 4a8264f..73cc24e 100644
--- a/frontend/src/app/pages/check-in-placeholder-page.component.ts
+++ b/frontend/src/app/pages/check-in-placeholder-page.component.ts
@@ -1,28 +1,113 @@
-import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { DatePipe } from '@angular/common';
+import { HttpErrorResponse } from '@angular/common/http';
+import { ChangeDetectionStrategy, Component, DestroyRef, inject, signal } from '@angular/core';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { FormBuilder, ReactiveFormsModule, Validators } from '@angular/forms';
+import { RouterLink } from '@angular/router';
+import { MatButtonModule } from '@angular/material/button';
 import { MatCardModule } from '@angular/material/card';
 import { MatFormFieldModule } from '@angular/material/form-field';
 import { MatInputModule } from '@angular/material/input';
+import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
+
+import { CheckInPreviewResponse, ShowsApiService } from '../services/shows-api.service';
+
+type UiState =
+  | 'idle'
+  | 'preview_loading'
+  | 'preview_success'
+  | 'confirm_loading'
+  | 'confirm_success'
+  | 'invalid_token'
+  | 'pending_reservation'
+  | 'already_checked_in'
+  | 'unauthorized'
+  | 'error';
 
 @Component({
   standalone: true,
-  imports: [MatCardModule, MatFormFieldModule, MatInputModule],
+  imports: [
+    DatePipe,
+    ReactiveFormsModule,
+    RouterLink,
+    MatButtonModule,
+    MatCardModule,
+    MatFormFieldModule,
+    MatInputModule,
+    MatProgressSpinnerModule,
+  ],
   template: `
     <section class="page">
       <header class="page-header">
         <p class="eyebrow">Staff check-in</p>
-        <h1>Mobile-friendly placeholder</h1>
-        <p class="supporting">
-          This route is ready for the authenticated token preview and check-in confirmation flow.
-        </p>
+        <h1>Token validation</h1>
+        <p class="supporting">Enter an opaque token to preview admission data and confirm entrance.</p>
       </header>
 
       <mat-card class="content-card">
-        <mat-card-title>Future scan/lookup input</mat-card-title>
         <mat-card-content>
-          <mat-form-field appearance="outline" class="full-width">
-            <mat-label>Opaque QR token</mat-label>
-            <input matInput placeholder="Paste or scan token" readonly>
-          </mat-form-field>
+          <form [formGroup]="tokenForm" (ngSubmit)="preview()" novalidate>
+            <mat-form-field appearance="outline" class="full-width">
+              <mat-label>Opaque token</mat-label>
+              <input matInput formControlName="token" autocomplete="off" />
+              @if (tokenForm.controls.token.touched && tokenForm.controls.token.hasError('required')) {
+                <mat-error>Token is required.</mat-error>
+              }
+            </mat-form-field>
+
+            <div class="actions">
+              <button mat-flat-button type="submit" [disabled]="isBusy()">
+                @if (state() === 'preview_loading') {
+                  <mat-progress-spinner mode="indeterminate" diameter="18"></mat-progress-spinner>
+                  <span>Validating...</span>
+                } @else {
+                  <span>Preview check-in</span>
+                }
+              </button>
+              <a mat-button routerLink="/">Home</a>
+              <a mat-button routerLink="/shows">Shows</a>
+            </div>
+          </form>
+
+          @if (state() === 'preview_success' && previewData()) {
+            <section class="preview-panel" aria-live="polite">
+              <h2>Admission preview</h2>
+              <dl>
+                <div><dt>Show</dt><dd>{{ previewData()!.show_title }}</dd></div>
+                <div><dt>Starts at</dt><dd>{{ previewData()!.starts_at | date: 'EEEE d MMMM, HH:mm' }}</dd></div>
+                <div><dt>Party size</dt><dd>{{ previewData()!.party_size }}</dd></div>
+                <div><dt>Reservation</dt><dd>#{{ previewData()!.reservation_id }}</dd></div>
+              </dl>
+              <button mat-flat-button type="button" (click)="confirm()" [disabled]="isBusy()">
+                @if (state() === 'confirm_loading') {
+                  <mat-progress-spinner mode="indeterminate" diameter="18"></mat-progress-spinner>
+                  <span>Confirming...</span>
+                } @else {
+                  <span>Confirm check-in</span>
+                }
+              </button>
+            </section>
+          }
+
+          @if (state() === 'confirm_success') {
+            <p class="success-message" aria-live="polite">Check-in confirmed successfully.</p>
+          }
+
+          @if (state() === 'invalid_token') {
+            <p class="error-message" aria-live="assertive">Invalid token.</p>
+          }
+          @if (state() === 'pending_reservation') {
+            <p class="error-message" aria-live="assertive">Reservation is still pending confirmation.</p>
+          }
+          @if (state() === 'already_checked_in') {
+            <p class="error-message" aria-live="assertive">This reservation is already checked in.</p>
+          }
+          @if (state() === 'unauthorized') {
+            <p class="error-message" aria-live="assertive">You are not authorized. Staff login is required.</p>
+          }
+          @if (state() === 'error') {
+            <p class="error-message" aria-live="assertive">Something went wrong. Please try again.</p>
+          }
         </mat-card-content>
       </mat-card>
     </section>
@@ -66,7 +151,146 @@ import { MatInputModule } from '@angular/material/input';
     .full-width {
       width: 100%;
     }
+
+    .actions {
+      display: flex;
+      gap: 10px;
+      align-items: center;
+      flex-wrap: wrap;
+    }
+
+    button[mat-flat-button] {
+      min-width: 150px;
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+      gap: 8px;
+    }
+
+    .preview-panel {
+      margin-top: 18px;
+      border-top: 1px solid var(--azionelab-border);
+      padding-top: 16px;
+    }
+
+    .preview-panel h2 {
+      margin: 0 0 12px;
+      font-size: 1.15rem;
+    }
+
+    .preview-panel dl {
+      display: grid;
+      gap: 10px;
+      margin: 0 0 16px;
+    }
+
+    .preview-panel dt {
+      font-size: 0.8rem;
+      text-transform: uppercase;
+      color: var(--azionelab-muted);
+      font-weight: 700;
+    }
+
+    .preview-panel dd {
+      margin: 2px 0 0;
+    }
+
+    .success-message {
+      margin: 16px 0 0;
+      color: #2e7d32;
+      font-weight: 600;
+    }
+
+    .error-message {
+      margin: 16px 0 0;
+      color: #b3261e;
+      font-weight: 500;
+    }
   `],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CheckInPlaceholderPageComponent {}
+export class CheckInPlaceholderPageComponent {
+  private readonly destroyRef = inject(DestroyRef);
+  private readonly formBuilder = inject(FormBuilder);
+  private readonly showsApi = inject(ShowsApiService);
+
+  protected readonly tokenForm = this.formBuilder.nonNullable.group({
+    token: ['', [Validators.required]],
+  });
+
+  protected readonly state = signal<UiState>('idle');
+  protected readonly previewData = signal<CheckInPreviewResponse | null>(null);
+
+  protected preview(): void {
+    if (this.tokenForm.invalid) {
+      this.tokenForm.markAllAsTouched();
+      return;
+    }
+
+    const token = this.tokenForm.controls.token.value.trim();
+    if (!token) {
+      this.tokenForm.controls.token.setErrors({ required: true });
+      return;
+    }
+
+    this.state.set('preview_loading');
+    this.previewData.set(null);
+
+    this.showsApi.previewCheckIn(token)
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe({
+        next: (response) => {
+          this.previewData.set(response);
+          this.state.set('preview_success');
+        },
+        error: (error: HttpErrorResponse) => this.setErrorState(error),
+      });
+  }
+
+  protected confirm(): void {
+    const token = this.tokenForm.controls.token.value.trim();
+    if (!token) {
+      this.state.set('invalid_token');
+      return;
+    }
+
+    this.state.set('confirm_loading');
+
+    this.showsApi.confirmCheckIn(token)
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe({
+        next: () => {
+          this.state.set('confirm_success');
+        },
+        error: (error: HttpErrorResponse) => this.setErrorState(error),
+      });
+  }
+
+  protected isBusy(): boolean {
+    return this.state() === 'preview_loading' || this.state() === 'confirm_loading';
+  }
+
+  private setErrorState(error: HttpErrorResponse): void {
+    if (error.status === 401 || error.status === 403) {
+      this.state.set('unauthorized');
+      return;
+    }
+
+    if (error.status === 404) {
+      this.state.set('invalid_token');
+      return;
+    }
+
+    if (error.status === 409 && error.error?.status === 'reservation_not_confirmed') {
+      this.state.set('pending_reservation');
+      return;
+    }
+
+    if (error.status === 409 && error.error?.status === 'already_checked_in') {
+      this.state.set('already_checked_in');
+      return;
+    }
+
+    this.state.set('error');
+  }
+}
diff --git a/frontend/src/app/services/shows-api.service.ts b/frontend/src/app/services/shows-api.service.ts
index 896a00e..b34d08c 100644
--- a/frontend/src/app/services/shows-api.service.ts
+++ b/frontend/src/app/services/shows-api.service.ts
@@ -52,6 +52,24 @@ export type ReservationConfirmResponse = {
   qr_code_image?: string;
 };
 
+export type CheckInPreviewResponse = {
+  status: 'valid';
+  reservation_id: number;
+  performance_id: number;
+  show_title: string;
+  starts_at: string;
+  party_size: number;
+};
+
+export type CheckInConfirmResponse = {
+  status: 'checked_in';
+  reservation_id: number;
+  performance_id: number;
+  party_size: number;
+  checked_in_at: string;
+  checked_in_by: number;
+};
+
 type ShowListResponse = {
   results: ShowListItem[];
 };
@@ -93,4 +111,12 @@ export class ShowsApiService {
       params: { token },
     });
   }
+
+  previewCheckIn(token: string): Observable<CheckInPreviewResponse> {
+    return this.http.post<CheckInPreviewResponse>(`${this.apiBaseUrl}/check-ins/preview/`, { token });
+  }
+
+  confirmCheckIn(token: string): Observable<CheckInConfirmResponse> {
+    return this.http.post<CheckInConfirmResponse>(`${this.apiBaseUrl}/check-ins/confirm/`, { token });
+  }
 }