paypal.Button.render({
 env: 'production', // Optional: specify 'sandbox' environment
 client: {
   sandbox:    'xxxxxxxxx',
   production: 'xxxxxxxxx'
 },
 commit: true, // Optional: show a 'Pay Now' button in the checkout flow
 payment: function (data, actions) {
   return actions.payment.create({
     payment: {
       transactions: [
         {
           amount: {
             total: '1.00',
             currency: 'USD'
           }
         }
       ]
     }
   });
 },
 onAuthorize: function (data, actions) {
   // Get the payment details
   return actions.payment.get()
     .then(function (paymentDetails) {
       // Show a confirmation using the details from paymentDetails
       // Then listen for a click on your confirm button
       document.querySelector('#confirm-button')
         .addEventListener('click', function () {
           // Execute the payment
           return actions.payment.execute()
             .then(function () {
               // Show a success page to the buyer
             });
         });
     });
 }
}, '#paypal-button');

这是Javascript的实现，最终将生成HTML。

这里有一个可供参考的链接:https://developer.paypal.com/docs/archive/checkout/how-to/customize-flow/#show-a-confirmation-page