Handle inline Paddle checkout responses

tests/ui/purchase/paddle-sandbox-full.test.ts

@@ -49,14 +49,32 @@ test.describe('Paddle sandbox full flow (staging)', () => {
       checkoutCta.click(),
     ]);
 
-    const checkoutPayload = await apiResponse.json();
-    const checkoutUrl: string = checkoutPayload.checkout_url ?? checkoutPayload.url ?? '';
+    const rawBody = await apiResponse.text();
+    let checkoutPayload: Record<string, unknown> | null = null;
+    try {
+      checkoutPayload = rawBody && rawBody.trim().startsWith('{') ? JSON.parse(rawBody) : null;
+    } catch {
+      checkoutPayload = null;
+    }
 
+    const inlineMode = checkoutPayload?.mode === 'inline' || checkoutPayload?.inline === true;
+    const checkoutUrl = extractCheckoutUrl(checkoutPayload, rawBody);
+
+    if (!inlineMode) {
       expect(checkoutUrl).toContain('paddle');
+    }
 
     // Navigate to Paddle hosted checkout and complete payment.
+    if (inlineMode) {
+      await expect(
+        page.getByText(/Checkout geöffnet|Checkout opened|Paddle-Checkout/i).first()
+      ).toBeVisible({ timeout: 20_000 });
+    } else if (checkoutUrl) {
       await page.goto(checkoutUrl);
       await expect(page).toHaveURL(/paddle/);
+    } else {
+      throw new Error(`Missing Paddle checkout URL. Response: ${rawBody}`);
+    }
 
     await completeHostedPaddleCheckout(page, sandboxCard);
 
@@ -178,6 +196,29 @@ async function completeHostedPaddleCheckout(
   await payButton.click();
 }
 
+function extractCheckoutUrl(payload: Record<string, unknown> | null, rawBody: string): string | null {
+  if (payload) {
+    const directUrl = payload.checkout_url ?? payload.url ?? payload.checkoutUrl;
+    if (typeof directUrl === 'string') {
+      return directUrl;
+    }
+  }
+
+  const trimmed = rawBody.trim();
+  if (/^https?:\/\//i.test(trimmed)) {
+    return trimmed;
+  }
+
+  if (trimmed.startsWith('<')) {
+    const match = trimmed.match(/https?:\/\/["'a-zA-Z0-9._~:/?#@!$&'()*+,;=%-]+/);
+    if (match) {
+      return match[0];
+    }
+  }
+
+  return null;
+}
+
 function buildTenantEmail(): string | null {
   const rawEmail = process.env.E2E_TENANT_EMAIL ?? process.env.E2E_PADDLE_EMAIL ?? null;
   if (!rawEmail) {