bashhttps://dynopay.com/api/user

bash# Create a checkout payment — just your API key, no customer setup!
curl -X POST https://dynopay.com/api/user/createPayment \
  -H "x-api-key: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"amount": 50, "redirect_uri": "https://yoursite.com/thanks"}'

# Or create a direct crypto payment with QR code:
curl -X POST https://dynopay.com/api/user/cryptoPayment \
  -H "x-api-key: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"amount": 25, "currency": "BTC", "redirect_uri": "https://yoursite.com/done"}'

# Optional: Create a customer for per-customer tracking
curl -X POST https://dynopay.com/api/user/createUser \
  -H "x-api-key: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"name": "Jane Smith", "email": "[email protected]"}'

bashcurl -X POST "https://dynopay.com/api/public/sandbox/payment-links" \
  -H "Authorization: Bearer dyno_sk_sandbox_demo_9f621db8" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 49.99,
    "currency": "USD",
    "description": "Pro Plan – Monthly",
    "customer_email": "[email protected]"
  }'

json{
  "object": "payment_link",
  "id": "plink_sandbox_2727324c61ebfb8b",
  "livemode": false,
  "sandbox": true,
  "status": "awaiting_payment",
  "amount": 49.99,
  "currency": "USD",
  "checkout_url": "https://dynopay.com/pay/…",
  "expires_at": "2026-07-05T16:14:12.536Z",
  "supported_chains": ["USDT-TRC20", "USDT-ERC20", …]
}

json{
  "event": "payment.confirmed",
  "payment_id": "pay_abc123def456",
  "transaction_id": "txn_789xyz",
  "amount": 0.00042,
  "currency": "BTC",
  "base_amount": "25.00",
  "base_currency": "USD",
  "status": "completed",
  "customer_email": "[email protected]",
  "merchant_id": 38,
  "destination_tag": null,
  "meta_data": { "order_id": "ORD-12345" },
  "timestamp": "2025-07-15T12:00:00.000Z"
}

javascriptconst crypto = require('crypto');

function verifyWebhook(payload, signature, secret) {
  const expectedSignature = crypto
    .createHmac('sha256', secret)
    .update(JSON.stringify(payload))
    .digest('hex');
  return signature === expectedSignature;
}

// In your Express webhook handler:
app.post('/webhooks/dynopay', (req, res) => {
  const signature = req.headers['x-dynopay-signature'];
  const isValid = verifyWebhook(req.body, signature, process.env.WEBHOOK_SECRET);

  if (!isValid) {
    return res.status(401).json({ error: 'Invalid signature' });
  }

  switch (req.body.event) {
    case 'payment.confirmed':
      // Fulfill order
      break;
    case 'payment.pending':
      // Show pending status
      break;
    case 'payment.underpaid':
      // Notify customer
      break;
  }

  // Always return 200 to acknowledge receipt
  res.status(200).json({ received: true });
});

json{
  "success": false,
  "message": "Amount must be greater than or equal to 5",
  "errors": [{ "key": "amount", "error": "Invalid amount" }]
}