Mobile Checkout

What it does

When your agent uses it

• A mobile app must open a backend-created checkout session
• Handle deep link
• Custom URL scheme returns
• Recover abandoned checkouts

Example prompts

• “/mobile-checkout”

Requirements

• A credential in DODO_PAYMENTS_API_KEY

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Backend: Create a checkout session via client.checkoutSessions.create(...) and return the checkout_url to your mobile app.
2. 2Mobile app: Call the platform-specific SDK with the checkout URL and a registered return URL scheme.
3. 3Browser context: The SDK opens the URL in a secure system browser: SFSafariViewController on iOS and Chrome Custom Tabs on Android.
4. 4Return: After payment, the browser navigates to your return URL. The SDK captures the result and passes it to your app.
5. 5Verification: Query the checkout session or listen for a webhook to confirm the payment before granting access.

What it can do on your machine

Read from SKILL.md and the folder at commit 9e7b281. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • docs.dodopayments.com
  • pub.dev

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • DODO_PAYMENTS_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mobile Checkout loads about 2.5k tokens when it runs, and up to ~5k if it reads all its reference files. Until then it costs about 87 tokens; SKILL.md has 692 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~87

When it runs · the whole SKILL.md, loaded when a task matches

~2.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 9e7b281, republished under its Apache-2.0 licence (© hashgraph-online). 692 words, ~2,453 tokens.

name

mobile-checkout

description

Dodo Payments in-app checkout for React Native, Flutter, native iOS, and Android using SFSafariViewController or Chrome Custom Tabs. Use when a mobile app must open a backend-created checkout session, handle deep link or custom URL scheme returns, recover abandoned checkouts, and verify payment server-side before unlocking access.

import DodoPayments from 'dodopayments';

const client = new DodoPayments({
  bearerToken: process.env.DODO_PAYMENTS_API_KEY,
  environment: 'test_mode',
});

const MOBILE_PRODUCTS = new Map([
  ['starter', 'pdt_starter123'],
  ['pro', 'pdt_pro456'],
]);

app.post('/api/mobile-checkout', requireAuth, async (req, res) => {
  const productId = MOBILE_PRODUCTS.get(req.body.plan);

  if (!productId) {
    return res.status(400).json({ error: 'Invalid plan' });
  }

  // requireAuth derives this mapping from the authenticated server-side session.
  const customerId = req.auth.dodoCustomerId;
  
  const session = await client.checkoutSessions.create({
    product_cart: [{ product_id: productId, quantity: 1 }],
    customer: { customer_id: customerId },
    return_url: 'myapp://checkout/return',
  });
  
  res.json({ checkout_url: session.checkout_url });
});

// Mount with express.raw({ type: 'application/json' }) so req.body is the raw Buffer.
app.post('/webhook', async (req, res) => {
  let event;
  try {
    event = client.webhooks.unwrap(req.body.toString(), {
      headers: {
        'webhook-id': req.headers['webhook-id'] as string,
        'webhook-signature': req.headers['webhook-signature'] as string,
        'webhook-timestamp': req.headers['webhook-timestamp'] as string,
      },
    });
  } catch {
    return res.status(401).json({ error: 'Invalid signature' });
  }

  try {
    // Dodo retries and may redeliver: claim webhook-id with a UNIQUE insert
    // and grant in the same transaction so a duplicate is a no-op.
    await db.$transaction(async (tx) => {
      const claim = await tx.webhookLog.createMany({
        data: [{ webhookId: req.headers['webhook-id'] as string, eventType: event.type }],
        skipDuplicates: true,
      });
      if (claim.count === 0) return; // already processed

      if (event.type === 'payment.succeeded') {
        await grantAccess(event.data.customer.customer_id, tx);
      }
    });
  } catch (error) {
    // Non-2xx makes Dodo retry; the transaction rolled back the claim.
    return res.status(500).json({ error: 'Processing failed' });
  }

  res.json({ received: true });
});

const session = await client.checkoutSessions.retrieve(sessionId);

if (session.payment_status === 'succeeded' && session.payment_id) {
  const payment = await client.payments.retrieve(session.payment_id);
  await grantAccess(payment.customer.customer_id);
}

// WRONG
const client = new DodoPayments({
  bearerToken: 'dodo_live_abc123...',  // Never hardcode
});

// CORRECT
const client = new DodoPayments({
  bearerToken: process.env.DODO_PAYMENTS_API_KEY,  // Backend only
});

// WRONG
if (result.status === 'succeeded') {
  grantAccess();  // No verification
}

// CORRECT
if (result.status === 'succeeded') {
  const verified = await verifyPaymentOnBackend(result.paymentId);
  if (verified) {
    grantAccess();
  }
}

// WRONG
if (result.status === 'succeeded') {
  showSuccess();
}

// CORRECT
switch (result.status) {
  case 'succeeded':
    showSuccess();
    break;
  case 'failed':
    showFailure();
    break;
  case 'cancelled':
  case 'pending':
    // Unknown outcome - reconcile, never show a failure
    reconcileAbandonedSession();
    break;
  case 'expired':
    showExpired();
    break;
}

// WRONG
// No recovery logic

// CORRECT: reconcile on launch and after every cancelled/pending result,
// and clear the record only once the backend reports a final outcome.
await reconcileAbandonedSession(); // defined in references/react-native.md

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in plugins/dodopayments/dodo-agent-plugin/skills/mobile-checkout of hashgraph-online/awesome-codex-plugins.

• SKILL.md
• references/android.md
• references/flutter.md
• references/ios.md
• references/react-native.md

Open the folder on GitHubat commit 9e7b281