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Add the Amazon Pay Button

[Step 2 of 9] The Amazon Pay checkout experience starts when the buyer clicks on the Amazon Pay button. Add the Express button wherever the buyer starts checkout, such as on the mini cart, shopping cart page, or checkout page. Additionally, you can add Amazon Pay to the payment selection at the end of checkout of your shop.

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 shipping address and payment instrument.

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=""></script>
<script src=""></script>
<script src=""></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 checkoutReviewReturnUrl to the URL that the buyer is redirected to after they complete checkout on the Amazon Pay hosted page. The Checkout Session ID will be appended as a query parameter to the provided URL.
  • 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.

Optional integrations steps:

  • Use the deliverySpecifications parameter to specify shipping restrictions and prevent buyers from selecting unsupported addresses from their Amazon address book. See address restriction samples for samples how to handle common use-cases.
  • If you registered for Amazon Pay in the EU or UK, you can use the presentmentCurrency parameter to charge your buyer using a different supported currency. See multi-currency integration for more info.

Payload example

    "webCheckoutDetails": {
        "checkoutReviewReturnUrl": ""
    "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
    "scopes": ["name", "email", "phoneNumber", "billingAddress"],
    "deliverySpecifications": {
        "specialRestrictions": ["RestrictPOBoxes"],
        "addressRestrictions": {
            "type": "Allowed",
            "restrictions": {
                "US": {
                    "statesOrRegions": ["WA"],
                    "zipCodes": ["95050", "93405"]
                "GB": {
                    "zipCodes": ["72046", "72047"]
                "IN": {
                    "statesOrRegions": ["AP"]
                "JP": {}

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
Default value: 'OneTime"

Type: deliverySpecifications
Specify shipping restrictions to prevent buyers from selecting unsupported addresses from their Amazon address book

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,
        'algorithm' => 'AMZN-PAY-RSASSA-PSS-V2'

    $client = new Amazon\Pay\API\Client($amazonpay_config);
    $payload = '{"storeId":"amzn1.application-oa2-client.xxxxx","webCheckoutDetails":{"checkoutReviewReturnUrl":""}}';
    $signature = $client->generateButtonSignature($payload);
    echo $signature . "\n";

Source code

var payConfiguration = new ApiConfiguration
    region: Region.Europe,
    environment: Environment.Sandbox,
    publicKeyId: "MY_PUBLIC_KEY_ID",
    algorithm: AmazonSignatureAlgorithm.V2

var request = new  CreateCheckoutSessionRequest
    checkoutReviewReturnUrl: "",
    storeId: "amzn1.application-oa2-client.xxxxx"

request.ChargePermissionType = ChargePermissionType.Onetime;

// 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.xxxxx\",\"webCheckoutDetails\":{\"checkoutReviewReturnUrl\":\"\"}}";
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,
    algorithm: 'AMZN-PAY-RSASSA-PSS-V2'

const testPayClient = new Client.AmazonPayClient(config);
const payload = {
    webCheckoutDetails: {
        checkoutReviewReturnUrl: ''
    storeId: 'amzn1.application-oa2-client.xxxxx'
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: price
This is the estimated checkout order amount, it does not have to match the final order amount if the buyer updates their order after starting checkout. Amazon Pay will use this value to assess transaction risk and prevent buyers from selecting payment methods that can't be used to process the order

Type: string
Product type selected for checkout

Supported values:
  • 'PayAndShip' - Offer checkout using buyer's Amazon wallet and address book. Select this product type if you need the buyer's shipping details
  • 'PayOnly' - Offer checkout using only the buyer's Amazon wallet. Select this product type if you do not need the buyer's shipping details
  • 'SignIn' - Offer Amazon Sign-in. Select this product type if you need buyer details before the buyer starts Amazon Pay checkout. See Amazon Sign-in for more information.
Default value: 'PayAndShip'

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