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Add the Amazon Pay Button

[Step 2 of 7] The Amazon Pay checkout experience starts when the buyer clicks on the Amazon Pay button. Add the button wherever the buyer starts setup or checkout, such as on the mini cart, shopping cart page, or checkout page.

In this step, you will configure the Amazon Pay Checkout Session object and then render the Amazon Pay button. At the end of this step, you will be able to redirect the buyer to an Amazon Pay hosted page where they can select their preferred payment method.

You must add the domains where the Amazon Pay button will be rendered to Seller Central. See Add domains to Seller Central for more information.

1. Add the Amazon Pay script

Add the Amazon Pay script to your HTML file. Be sure you select the correct region.

<script src="https://static-na.payments-amazon.com/checkout.js"></script>
<script src="https://static-eu.payments-amazon.com/checkout.js"></script>
<script src="https://static-fe.payments-amazon.com/checkout.js"></script>

2. Generate the Create Checkout Session payload

To render the Amazon Pay button, you will need to provide a payload that Amazon Pay will use to create a Checkout Session object. You will use the Checkout Session object to manage the buyer’s active session on your website. The payload has the same structure as the request body for the Create Checkout Session API. Providing the payload as part of the button removes the need to call this API. In the payload, you must provide all details required for the buyer to complete checkout.

Instructions for generating button payload:

  • Set checkoutResultReturnUrl parameter to the URL that the buyer is redirected to after they select their preferred payment method. The Checkout Session ID will be appended as a query parameter.
  • Set chargePermissionType to PaymentMethodOnFile
  • Provide details for paymentMethodOnFileMetadata: Provide setupOnly = true to initiate setup intent flow
  • Specify the buyer information you need to complete checkout using the scopes parameter. If you do not set this value, all buyer information except billing address will be requested.
  • Set paymentIntent = Confirm since there is no transaction happening in setup flow.

Payload example

    "webCheckoutDetails": {
        "checkoutResultReturnUrl": "https://a.com/merchant-review-page"
    "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
    "scopes": ["name", "email", "phoneNumber", "billingAddress"],
    "chargePermissionType": "PaymentMethodOnFile",   
    "paymentMethodOnFileMetadata": {
        "setupOnly": true
    "paymentDetails": {
        "paymentIntent": "Confirm",
        "canHandlePendingAuthorization": false        

Type: webCheckoutDetails
URLs associated to the Checkout Session used to complete checkout. The URLs must use HTTPS protocol

Type: string
Amazon Pay store ID. Retrieve this value from Amazon Pay Integration Central: US, EU, JP

Type: list <scope>
The buyer details that you're requesting access to. Specify whether you need shipping address using button productType parameter in Step 4.

Supported values:
  • 'name' - Buyer name
  • 'email' - Buyer email
  • 'phoneNumber' - Buyer phone number. You must also request billingAddress scope or use payAndShip productType to retrieve the billing address or shipping address phone number.
  • 'billingAddress' - Default billing address
Default value: all buyer information except billing address is requested if the scopes parameter is not set

Type: string
The type of Charge Permission requested

Supported values:
  • 'OneTime' - The Charge Permission can only be used for a single order
  • 'Recurring' - The Charge Permission can be used for recurring orders
  • 'PaymentMethodOnFile' - The Charge Permission can be used for Saved Wallet orders
Default value: 'OneTime"

Type: paymentDetails
Payment details specified by the merchant such as the amount and method for charging the buyer

Modifiable: Multiple times before the buyer is redirected to the amazonPayReturnUrl

Type: merchantMetadata
External order details provided by the merchant

Modifiable: Multiple times before the buyer is redirected to the amazonPayReturnUrl

Type: paymentMethodOnFileMetadata
Metadata about how the Saved Wallet charge permission will be used.

3. Sign the payload

You must secure the payload using a signature. The payload does not include a timestamp so you can re-use the signature as long as the payload does not change. If you need to change the payload and your button signature is dynamic, you should decouple button render from checkout initialization to avoid re-rendering the button.

Option 1 (recommended): Generate a signature using the helper function provided in the Amazon Pay SDKs. The signature generated by the helper function is only valid for the button and not for API requests.

    include 'vendor/autoload.php';

    $amazonpay_config = array(
        'public_key_id' => 'MY_PUBLIC_KEY_ID',
        'private_key'   => 'keys/private.pem',
        'region'        => 'US',
        'sandbox'       => true

    $client = new Amazon\Pay\API\Client($amazonpay_config);
    $payload = '{"storeId":"amzn1.application-oa2-client.xxxxx","webCheckoutDetails":{"checkoutResultReturnUrl":"https://example.com/review.html"},"chargePermissionType":"PaymentMethodOnFile","paymentMethodOnFileMetadata":{"setupOnly": true}, "paymentDetails": {"paymentIntent": "Confirm", "canHandlePendingAuthorization": false}}';
    $signature = $client->generateButtonSignature($payload);
    echo $signature . "\n";

Source code

var payConfiguration = new ApiConfiguration
    region: Region.Europe,
    environment: Environment.Sandbox,
    publicKeyId: "MY_PUBLIC_KEY_ID",

var request = new  CreateCheckoutSessionRequest
    checkoutReviewReturnUrl: "https://example.com/review.html",
    storeId: "amzn1.application-oa2-client.xxxxx"

request.ChargePermissionType = ChargePermissionType.PaymentMethodOnFile;
request.PaymentMethodOnFileMetadata.SetupOnly = true;
request.PaymentDetails.PaymentIntent = PaymentIntent.Confirm;
request.PaymentDetails.CanHandlePendingAuthorization = false;

// generate the button signature
var signature = client.GenerateButtonSignature(request);

// the payload as JSON string that you must assign to the button in the next step
var payload = request.ToJson(); 

Source code

PayConfiguration payConfiguration = null;
try {
    payConfiguration = new PayConfiguration()
}catch (AmazonPayClientException e) {

AmazonPayClient client = new AmazonPayClient(payConfiguration);

String payload = "{\"storeId\":\"amzn1.application-oa2-client.xxxxxx\",\"webCheckoutDetails\":{\"checkoutResultReturnUrl\":\"https://example.com/review.html\"},\"chargePermissionType\":\"PaymentMethodOnFile\",\"paymentMethodOnFileMetadata\":{\"setupOnly\": true}, \"paymentDetails\": {\"paymentIntent\": \"Confirm\", \"canHandlePendingAuthorization\": false}}";
String signature = client.generateButtonSignature(payload);

Source code

const fs = require('fs');
const Client = require('@amazonpay/amazon-pay-api-sdk-nodejs');

const config = {
    publicKeyId: 'ABC123DEF456XYZ',
    privateKey: fs.readFileSync('tst/private.pem'),
    region: 'us',
    sandbox: true

const testPayClient = new Client.AmazonPayClient(config);
const payload = {
    "webCheckoutDetails": {
        "checkoutResultReturnUrl": "https://example.com/review.html"
    "storeId": "amzn1.application-oa2-client.xxxxx",
    "chargePermissionType": "PaymentMethodOnFile",   
    "paymentMethodOnFileMetadata": {
        "setupOnly": true
    "paymentDetails": {
        "paymentIntent": "Confirm",
        "canHandlePendingAuthorization": false
const signature = testPayClient.generateButtonSignature(payload);

Source code

Option 2: Build the signature manually by following steps 2 and 3 of the signing requests guide.

4. Render the button

Use the values from the previous two steps to render the Amazon Pay button to a HTML container element. The button will be responsive and it will inherit the size of the container element, see responsive button logic for details.

The code below will initiate Amazon Pay checkout immediately on button click. If you need control of the click event, you can decouple button render and checkout initiation. See Amazon Pay script for more info.

Code sample

Function parameters


Type: string
Amazon Pay merchant account identifier

Type: buttonConfig
Create Checkout Session configuration. This is a required field if you use PayAndShip or PayOnly productType

Type: string
Placement of the Amazon Pay button on your website

Supported values:
  • 'Home' - Initial or main page
  • 'Product' - Product details page
  • 'Cart' - Cart review page before buyer starts checkout
  • 'Checkout' - Any page after buyer starts checkout
  • 'Other' - Any page that doesn't fit the previous descriptions

Type: string
Ledger currency provided during registration for the given merchant identifier

Supported values:
  • US merchants - 'USD'
  • EU merchants - 'EUR'
  • UK merchants - 'GBP'
  • JP merchants - 'JPY'

Type: string
Product type selected for checkout

Supported values:
  • 'PayOnly' - Offer checkout using only the buyer's Amazon wallet. Select this product type if you do not need the buyer's shipping details
Default value: 'PayOnly'

Type: string
Color of the Amazon Pay button

Supported values: 'Gold', 'LightGray', 'DarkGray'
Default value: 'Gold'

Type: string
Language used to render the button and text on Amazon Pay hosted pages. Please note that supported language(s) is dependent on the region that your Amazon Pay account was registered for

Supported values: 
  • US merchants - 'en_US'
  • EU/UK merchants - 'en_GB', 'de_DE', 'fr_FR', 'it_IT', 'es_ES'
  • JP merchants - 'ja_JP'

Type: boolean
Sets button to Sandbox environment

You do not have to set this parameter if your publicKeyId has an environment prefix (for example: SANDBOX-AFVX7ULWSGBZ5535PCUQOY7B)

Default value: false