**[ This description is mirrored from README.md at [github.com/morbidick/paypal-express-checkout](https://github.com//morbidick/paypal-express-checkout/blob/v1.0.1/README.md) on 2019-05-10 ]** # Polymer 2 wrapper for the Paypal Express Checkout button [](https://www.webcomponents.org/element/morbidick/paypal-express-checkout)  ## Components ### \ To work around [paypals issue with ShadowDOM](https://github.com/paypal/paypal-checkout/issues/353) this element opens the paypal button in an embedded iframe and communicates via `postMessage`. ````html ```` ### \ Using the (older) [paypal form api](https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/formbasics/), a robuster checkout can be accomplished. To get notified about payments you have to set `notify` to an [IPN](https://developer.paypal.com/docs/classic/products/instant-payment-notification/) url on your site. ````html ```` ## Polymer build To build include the paypal.html in your `polymer.json`. ```json "extraDependencies": [ "bower_components/paypal-express-checkout/paypal.html" ] ``` ## Development ```bash # Get dependencies $ npm install # Demo site $ npm start # Run tests $ npm test ```