The SuperPay Checkout API tells your shoppers which credit card earns them the most cash back, points, or miles on this exact purchase. 100% free for merchants — no fees, no rev share, no contract. A frictionless value-add at checkout that earns your shoppers more.
<script src="/v1/widget.js"> using a live sandbox key. View Source to inspect.
Higher conversion, no new processor, zero friction at checkout. Looks like a trust mark — works like a payment co-pilot.
Shoppers who see real cash-back math at checkout reach for higher-tier carts. The pill rewards spending, not abandoning.
One <script> tag plus a <div>. No SDK, no build step, no processor change. Works on Shopify, Magento, custom carts.
The pill picks the best card from the same comprehensive catalog SuperPay's app uses, with a sign-up CTA if your shopper doesn't have it yet.
We never see your shopper's card number. v0 is anonymous — no shopper email, no PII ever leaves your checkout. Authentication, attribution, and billing all flow through SuperPay.
If our API has a bad minute the widget silently no-ops. The recommendation pill never blocks the buy button, never throws a console error.
Every recommendation is logged for attribution so you can see lift, top categories, and which cards your shoppers reach for. Free, not behind any tier.
The Card-Recommendation Widget is 100% free for merchants — forever. No fees, no rev share, no contract. SuperPay treats the widget as a value-add at checkout and a shopper-acquisition channel, not a revenue line.
No fees. No rev share. No contract.
Render the recommendation pill anywhere in your checkout — header, line items, near the buy button. The script is async, <6kb gzipped, and never blocks page load.
amount, optional mcc, optional merchant_name.data-theme="light" or "dark".POST /v1/recommend directly.<div data-superpay-recommend
data-amount="87.45"
data-mcc="5411"
data-merchant="Whole Foods Market"
data-theme="light"></div>
<script
src="https://superpayrewards.com/v1/widget.js"
data-key="sp_live_…" async></script>The same SuperPay rewards engine that helps consumers unlock $1,200+/year in missed rewards now ships as an API.
Tell us about your project. We'll verify your email, review your application, and issue your sp_live_… key — usually within 1 business day.
A polished, send-ready document covering why the widget lifts conversion, a full API walkthrough, code samples in Node/Python/Shopify, security & compliance, FAQs, and a launch checklist. Read it on the web or download as a PDF to share internally.