Integration preview.

Add the qardon.com checkout JS to your page (typically in <head>):

<!-- Add to your checkout page -->
<script src="https://js.qardon.com/v1/checkout.js"></script>

<!-- Render the button at checkout -->
<button
  class="qardon-checkout-btn"
  data-qardon-merchant-id="YOUR_MERCHANT_ID"
  data-amount="5000.00"
  data-currency="USD"
  data-order-id="ORDER-12345"
  data-installments="12,24,36,48">
  Pay in installments — 0% interest via qardon.com
</button>

Specified, not yet built. The design: the customer clicks, our JS opens a hosted modal handling identity verification, a creditworthiness check, installment-plan selection, agreement signing and payment-method capture, and on approval we POST a webhook to your configured endpoint with the transaction ID and approved installment schedule. Settlement to your merchant account begins per your agreed schedule.

curl -X POST https://api.qardon.com/api/v1/merchant/transactions \
  -H "Authorization: Bearer ${QARDON_API_KEY}" \
  -H "X-Qardon-Signature: ${HMAC_SIGNATURE}" \
  -H "X-Qardon-Idempotency-Key: ${UUID}" \
  -H "Content-Type: application/json" \
  -d '{
    "merchant_id": "merch_abc123",
    "amount_cents": 500000,
    "currency": "USD",
    "order_id": "ORDER-12345",
    "customer": {
      "email": "[email protected]",
      "first_name": "Jane",
      "last_name": "Doe",
      "billing_address": { ... }
    },
    "installment_options": [12, 24, 36, 48],
    "category": "furniture",
    "metadata": { "sku": "couch-large", "store_id": "store-7" },
    "webhook_url": "https://yourstore.example/qardon-webhook"
  }'

Response includes a hosted checkout URL for redirect, or — for fully embedded flows — a transaction token to inject into your in-page Qardon Element. Approval result + final installment schedule arrives via the configured webhook.