Payments in AMP
Via amp-iframe and the
allowpaymentrequest attribute, AMP pages can support requesting payment information directly from the browser. The PaymentRequest API is an open W3C spec with support from most major browsers. This example won't go into detail on the API, but you can get more information in this deep dive article.
This example shows how to embed an iframe that contains only a "buy now" button. All of the actual payment logic is contained within the iframe src itself.
The only extra component needed for this example is amp-iframe.
<script async custom-element="amp-iframe" src="https://cdn.ampproject.org/v0/amp-iframe-0.1.js"></script>
Configuring the Iframe
In the basic case, the AMP page hands off all PaymentRequest logic to the iframe to complete purchase of a single item.
Crtically, the iframe does two things:
- Sets the
allowpaymentrequestattribute, which gives the iframe source permission to call PaymentRequest.show().
- Passes a relevant product identifier via query string, allowing the iframe to retrive appropriate product information for this product.
<amp-iframe title="Buy Now button to retrieve product information" width="130" height="42" sandbox="allow-scripts allow-same-origin allow-top-navigation" allowpaymentrequest frameborder="0" noloading src="https://amp-by-example-api.appspot.com/iframe/payments.html?productId=1"> <button placeholder disabled>Buy Now</button> </amp-iframe>
placeholderelement to the
amp-iframeto ensure that it can be loaded in the top viewport. The placeholder shows a disabled button until the iframe is loaded. We also disable the default loading animation using CSS.
- Swap the "Buy Now" button for an "Add to cart" button.
- Redirect to a standard checkout form.
- Hide the "Buy Now" button altogether, and have a separate AMP-based Add to Cart button (see the Product Page demo)
Written by @sebastianbenz