diff --git a/tests/ui/purchase/paddle-sandbox-full.test.ts b/tests/ui/purchase/paddle-sandbox-full.test.ts
index e73b63f..02efd24 100644
--- a/tests/ui/purchase/paddle-sandbox-full.test.ts
+++ b/tests/ui/purchase/paddle-sandbox-full.test.ts
@@ -16,11 +16,26 @@ const sandboxCard = {
   postal: process.env.E2E_PADDLE_CARD_POSTAL ?? '10115',
 };
 
+test.use({
+  userAgent:
+    process.env.E2E_USER_AGENT ??
+    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36',
+  launchOptions: {
+    args: ['--disable-blink-features=AutomationControlled'],
+  },
+});
+
 test.describe('Paddle sandbox full flow (staging)', () => {
   test.skip(!shouldRun, 'Set E2E_PADDLE_SANDBOX=1 to run live sandbox checkout on staging.');
   test.skip(!tenantEmail || !tenantPassword, 'Set E2E_TENANT_EMAIL and E2E_TENANT_PASSWORD for sandbox flow.');
 
   test('register, pay via Paddle sandbox, and login to event admin', async ({ page, request }) => {
+    await page.addInitScript(() => {
+      Object.defineProperty(navigator, 'webdriver', {
+        get: () => undefined,
+      });
+    });
+
     // Jump directly into wizard for Standard package (2)
     await page.goto(`${baseUrl}/${locale}/${checkoutSlug}/2`);
 
@@ -69,6 +84,7 @@ test.describe('Paddle sandbox full flow (staging)', () => {
       await expect(
         page.getByText(/Checkout geöffnet|Checkout opened|Paddle-Checkout/i).first()
       ).toBeVisible({ timeout: 20_000 });
+      await waitForPaddleCardInputs(page, ['input[autocomplete="cc-number"]', 'input[name="cardnumber"]', 'input[name="card_number"]']);
     } else if (checkoutUrl) {
       await page.goto(checkoutUrl);
       await expect(page).toHaveURL(/paddle/);
@@ -196,6 +212,62 @@ async function completeHostedPaddleCheckout(
   await payButton.click();
 }
 
+async function waitForPaddleCardInputs(page: Page, selectors: string[], timeoutMs = 30_000): Promise<void> {
+  const deadline = Date.now() + timeoutMs;
+
+  while (Date.now() < deadline) {
+    if (await hasAnySelector(page, selectors)) {
+      return;
+    }
+
+    if (await hasAnyText(page, /Something went wrong|try again later/i)) {
+      throw new Error('Paddle inline checkout returned an error in the iframe.');
+    }
+
+    await page.waitForTimeout(500);
+  }
+
+  throw new Error('Paddle card inputs did not appear in time.');
+}
+
+async function hasAnySelector(page: Page, selectors: string[]): Promise<boolean> {
+  if (await hasSelectorInFrame(page, selectors)) {
+    return true;
+  }
+
+  for (const frame of page.frames()) {
+    if (await hasSelectorInFrame(frame, selectors)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+async function hasSelectorInFrame(scope: Page | import('@playwright/test').Frame, selectors: string[]): Promise<boolean> {
+  for (const selector of selectors) {
+    if ((await scope.locator(selector).count()) > 0) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+async function hasAnyText(page: Page, matcher: RegExp): Promise<boolean> {
+  if ((await page.getByText(matcher).count()) > 0) {
+    return true;
+  }
+
+  for (const frame of page.frames()) {
+    if ((await frame.getByText(matcher).count()) > 0) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
 function extractCheckoutUrl(payload: Record<string, unknown> | null, rawBody: string): string | null {
   if (payload) {
     const directUrl = payload.checkout_url ?? payload.url ?? payload.checkoutUrl;