diff --git a/public/shop-seite.html b/public/shop-seite.html
new file mode 100644
index 0000000..203a116
--- /dev/null
+++ b/public/shop-seite.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<html lang="de">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="robots" content="noindex">
+<title>Shop</title>
+<style>
+  body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:#f6f7f9;color:#1f2937;line-height:1.5}
+  .seitenkopf{padding:16px 24px;background:#fff;border-bottom:1px solid #e5e7eb;font-weight:700}
+  main{max-width:960px;margin:0 auto;padding:24px 16px 48px}
+  .ausweich{margin:0;padding:16px;color:#4b5563}
+</style>
+</head>
+<body>
+<header class="seitenkopf" id="seitenkopf">Shop</header>
+<main>
+  <div data-webklar-shop="__SITEKEY__" data-ansicht="__ANSICHT__" data-api=""><p class="ausweich">Der Shop wird geladen …</p></div>
+  <noscript><p class="ausweich">Für den Shop wird JavaScript benötigt.</p></noscript>
+</main>
+<script src="/embed/shop.js" defer></script>
+</body>
+</html>
diff --git a/server/index.js b/server/index.js
index 3bbb0ae..3b82457 100644
--- a/server/index.js
+++ b/server/index.js
@@ -19,6 +19,7 @@ import funktionenRoutes from './routes/funktionen.js'
 import termineRoutes from './routes/termine.js'
 import shopRoutes from './routes/shop.js'
 import shopWebhookRoutes from './routes/shopWebhook.js'
+import { shopSeiteRouter } from './routes/shopSeite.js'
 import takeoverCreditRoutes from './routes/takeoverCredits.js'
 import { purgeExpiredUploads } from './services/takeoverCredits.js'
 import { purgePendingChatUploads } from './services/chatAttachments.js'
@@ -120,6 +121,8 @@ app.use('/embed/', (_req, res, next) => {
 })
 // Adressen ohne Fassung: aktuelle Fassung der Rechtstexte (Analyse und Terminplaner; vor express.static)
 app.use('/rechtliches', legalRouter())
+// Webshop-Seiten fuer Kaeufer: /shop/:siteKey und /shop/:siteKey/widerruf (vor express.static)
+app.use(shopSeiteRouter())
 // Abgeschaltetes Admin-Panel und Rechnungsanalyse: Links aus alten Team-Mails ins Ticketsystem
 app.use('/admin.html', legacyAdminRedirect.admin)
 app.use('/kalkulation.html', legacyAdminRedirect.kalkulation)
diff --git a/server/routes/shopSeite.js b/server/routes/shopSeite.js
new file mode 100644
index 0000000..4503411
--- /dev/null
+++ b/server/routes/shopSeite.js
@@ -0,0 +1,62 @@
+import { readFileSync } from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import { Router } from 'express'
+
+/**
+ * Oeffentliche Standalone-Seiten des Webshops (Plan 2026-10-05-webshop.md, H2; Spec 5.4):
+ *   GET /shop/:siteKey            Shop mit dem Widget public/embed/shop.js
+ *   GET /shop/:siteKey/widerruf   dieselbe Seite, das Widget oeffnet gleich die Widerrufsfunktion
+ * Die Seite verraet nicht, ob der Schluessel existiert oder der Shop aktiv ist: jeder syntaktisch gueltige Schluessel
+ * bekommt dieselbe Seite, ob der Shop laeuft entscheidet das Widget ueber die oeffentliche Schnittstelle. Alles andere ist 404.
+ */
+
+const SITE_KEY_RE = /^[a-z2-7]{16}$/
+const DATEI = path.join(path.dirname(fileURLToPath(import.meta.url)), '..', '..', 'public', 'shop-seite.html')
+const CSP = [
+  "default-src 'self'",
+  "img-src 'self' data:",
+  "script-src 'self'",
+  "style-src 'self' 'unsafe-inline'", // das Widget legt ein <style>-Element an
+  "connect-src 'self'",
+  "frame-ancestors 'none'",
+  "base-uri 'none'",
+  "form-action 'self'",
+].join('; ')
+
+let vorlage = null
+export function resetShopSeiteForTests() {
+  vorlage = null
+}
+
+function escapeAttr(s) {
+  return String(s).replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+}
+
+function seite(res, next, siteKey, ansicht) {
+  if (!SITE_KEY_RE.test(siteKey)) return res.status(404).type('text/plain').send('Not found')
+  try {
+    if (vorlage === null) vorlage = readFileSync(DATEI, 'utf8')
+  } catch (err) {
+    return next(err)
+  }
+  const html = vorlage.replace('__SITEKEY__', escapeAttr(siteKey)).replace('__ANSICHT__', escapeAttr(ansicht))
+  res.set({
+    'Content-Type': 'text/html; charset=utf-8',
+    'Cache-Control': 'no-store',
+    'X-Content-Type-Options': 'nosniff',
+    'Referrer-Policy': 'strict-origin-when-cross-origin',
+    'Content-Security-Policy': CSP,
+    'X-Robots-Tag': 'noindex',
+  })
+  return res.status(200).send(html)
+}
+
+export function shopSeiteRouter() {
+  const router = Router()
+  router.get('/shop/:siteKey', (req, res, next) => seite(res, next, req.params.siteKey, ''))
+  router.get('/shop/:siteKey/widerruf', (req, res, next) => seite(res, next, req.params.siteKey, 'widerruf'))
+  return router
+}
+
+export default shopSeiteRouter
diff --git a/test/shopSeite.test.js b/test/shopSeite.test.js
new file mode 100644
index 0000000..2a4bf74
--- /dev/null
+++ b/test/shopSeite.test.js
@@ -0,0 +1,81 @@
+import { test, after } from 'node:test'
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import { useTestEnv } from './support/testEnv.js'
+
+// Task H2: oeffentliche Shop-Seiten /shop/:siteKey und /shop/:siteKey/widerruf
+useTestEnv({ appwriteUrl: 'http://127.0.0.1:1', stripeUrl: 'http://127.0.0.1:1' })
+const { startTestApp } = await import('./support/testApp.js')
+const { shopSeiteRouter, resetShopSeiteForTests } = await import('../server/routes/shopSeite.js')
+
+resetShopSeiteForTests()
+const app = await startTestApp({ '/': shopSeiteRouter() })
+after(() => app.close())
+
+const KEY = 'abcdefghijklmnop'.replace(/[ilo]/g, 'a') // nur a-z und 2-7 wie siteKeys
+const get = async (path) => {
+  const r = await fetch(app.url + path)
+  return { status: r.status, headers: r.headers, text: await r.text() }
+}
+const lies = (pfad) => readFileSync(new URL(`../${pfad}`, import.meta.url), 'utf8')
+
+test('gueltiger Schluessel: 200 HTML mit Schluessel im Container und den Schutz-Headern', async () => {
+  const r = await get(`/shop/${KEY}`)
+  assert.equal(r.status, 200)
+  assert.match(r.headers.get('content-type'), /^text\/html; charset=utf-8/)
+  assert.match(r.text, new RegExp(`<div data-webklar-shop="${KEY}" data-ansicht="" data-api="">`))
+  assert.doesNotMatch(r.text, /__SITEKEY__|__ANSICHT__/)
+  assert.match(r.text, /<script src="\/embed\/shop\.js" defer><\/script>/)
+  assert.equal(r.headers.get('cache-control'), 'no-store')
+  assert.equal(r.headers.get('x-content-type-options'), 'nosniff')
+  assert.equal(r.headers.get('referrer-policy'), 'strict-origin-when-cross-origin')
+  assert.equal(r.headers.get('x-robots-tag'), 'noindex')
+  const csp = r.headers.get('content-security-policy')
+  for (const d of ["default-src 'self'", "script-src 'self'", "connect-src 'self'", "img-src 'self' data:", "frame-ancestors 'none'", "base-uri 'none'", "form-action 'self'"]) {
+    assert.ok(csp.includes(d), d)
+  }
+  assert.ok(!/script-src[^;]*unsafe/.test(csp), 'keine unsicheren Skripte')
+})
+
+test('/widerruf setzt data-ansicht="widerruf"', async () => {
+  const r = await get(`/shop/${KEY}/widerruf`)
+  assert.equal(r.status, 200)
+  assert.match(r.text, new RegExp(`data-webklar-shop="${KEY}" data-ansicht="widerruf"`))
+  assert.equal(r.headers.get('x-robots-tag'), 'noindex')
+})
+
+test('jeder syntaktisch gueltige Schluessel liefert dieselbe Seite (kein Orakel)', async () => {
+  const a = await get(`/shop/${KEY}`)
+  const b = await get('/shop/2222222222222222')
+  assert.equal(b.status, 200)
+  assert.equal(a.text.replaceAll(KEY, 'X'), b.text.replaceAll('2222222222222222', 'X'))
+})
+
+test('ungueltige Schluessel und fremde Pfade: 404', async () => {
+  for (const p of ['/shop/xyz', `/shop/${KEY.toUpperCase()}`, `/shop/${KEY}a`, '/shop/abcdefghijklmn01', '/shop/xyz/abc', `/shop/${KEY}/agb`, `/shop/${KEY}/widerruf/x`, '/shop/%3Cscript%3E', '/shop', '/shop/']) {
+    const r = await get(p)
+    assert.equal(r.status, 404, p)
+    assert.doesNotMatch(r.text, /data-webklar-shop/, p)
+  }
+})
+
+test('nur GET', async () => {
+  const r = await fetch(`${app.url}/shop/${KEY}`, { method: 'POST' })
+  assert.equal(r.status, 404)
+})
+
+test('shop-seite.html: kein Inline-Skript, nur das Widget; in server/index.js vor express.static gemountet', () => {
+  const html = lies('public/shop-seite.html')
+  const skripte = [...html.matchAll(/<script\b([^>]*)>([\s\S]*?)<\/script>/gi)]
+  assert.equal(skripte.length, 1)
+  assert.match(skripte[0][1], /\bsrc="\/embed\/shop\.js"/)
+  assert.equal(skripte[0][2].trim(), '')
+  assert.doesNotMatch(html, /\son[a-z]+\s*=/i, 'keine Inline-Handler')
+  assert.doesNotMatch(html, /javascript:/i)
+  assert.match(html, /<html lang="de">/)
+  assert.match(html, /<title>Shop<\/title>/)
+  assert.match(html, /Der Shop wird geladen …/)
+  const index = lies('server/index.js')
+  const mount = index.indexOf('app.use(shopSeiteRouter())')
+  assert.ok(mount > 0 && mount < index.indexOf('app.use(express.static(publicDir))'))
+})