``` '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":{"signInReturnUrl":"https://a.com/merchant-page"},"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", privateKey: "PATH_OR_CONTENT_OF_MY_PRIVATE_KEY" ); var request = new CreateCheckoutSessionRequest ( signInReturnUrl: "https://a.com/merchant-page", 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() .setPublicKeyId("YOUR_PUBLIC_KEY_ID") .setRegion(Region.YOUR_REGION_CODE) .setPrivateKey("YOUR_PRIVATE_KEY_STRING") .setEnvironment(Environment.SANDBOX); }catch (AmazonPayClientException e) { e.printStackTrace(); } AmazonPayClient client = new AmazonPayClient(payConfiguration); String payload = "{\"storeId\":\"amzn1.application-oa2-client.xxxxxx\",\"webCheckoutDetails\":{\"signInReturnUrl\":\"https://a.com/merchant-page\"},\"chargePermissionType\":\"PaymentMethodOnFile\",\"paymentMethodOnFileMetadata\":{\"setupOnly\": true}, \"paymentDetails\": {\"paymentIntent\": \"Confirm\", \"canHandlePendingAuthorization\": false}}"; String signature = client.generateButtonSignature(payload); ``` Source code

```html 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": { "signInReturnUrl": "https://a.com/merchant-page" }, "storeId": "amzn1.application-oa2-client.xxxxx", "chargePermissionType": "PaymentMethodOnFile", "paymentMethodOnFileMetadata": { "setupOnly": true }, "paymentDetails": { "paymentIntent": "Confirm", "canHandlePendingAuthorization": false } }; const signature = testPayClient.generateButtonSignature(payload); ``` Source code

Name	Location	Description
webCheckoutDetails (required) Type: webCheckoutDetails	Body	URLs associated to the Checkout Session used to complete checkout. The URLs must use HTTPS protocol
storeId (required) Type: string	Body	Amazon Pay store ID. Retrieve this value from Amazon Pay Integration Central: US, EU, JP
signInScopes Type: list <signInScopes>	Body	The buyer details that you are requesting access for. Note that Amazon Pay will always return `buyerId` even if no values are set for this parameter

Parameter	Description
checkoutReviewReturnUrl Type: string	Checkout review URL provided by the merchant. Amazon Pay will redirect to this URL after the buyer selects their preferred payment instrument and shipping address Note: In the Live environment, URLs must use HTTPS protocol. The URL domain must be added to Seller Central. See Add domains to Seller Central for more information. In the Sandbox environment, you don't need an SSL certificate and can use the HTTP protocol if you're testing on localhost (http://localhost). You don't need to add URLs to the JavaScript Origins in SellerCentral Max length: 1024 characters/bytes
checkoutResultReturnUrl Type: string	Checkout result URL provided by the merchant. Amazon Pay will redirect to this URL after completing the transaction Note: In the Live environment, URLs must use HTTPS protocol. In the Sandbox environment, you don't need an SSL certificate and can use the HTTP protocol if you're testing on localhost (http://localhost) Max length: 1024 characters/bytes
checkoutCancelUrl Type: string	Checkout cancellation URL provided by the merchant. Amazon Pay will redirect to this URL if the buyer cancels checkout on any Amazon Pay hosted page If you do not provide a `checkoutCancelUrl`, Amazon Pay will redirect the buyer using the following logic: Payment and address selection hosted page - redirect to referrer URL unless it's a different domain than `checkoutReviewReturnUrl`. If there is a domain mismatch, the buyer will be redirected to `checkoutReviewReturnUrl` Update payment and address hosted page - redirect to `checkoutReviewReturnUrl` Declined payment handling hosted page - redirect to `checkoutResultReturnUrl` Max length: 1024 characters/bytes
amazonPayRedirectUrl Type: string	URL provided by Amazon Pay. Merchant will redirect to this page after setting transaction details to complete checkout Max length: 256 characters/bytes
checkoutMode Type: string	Specify whether the buyer will return to your website to review their order before completing checkout Supported values: 'ProcessOrder' - Buyer will complete checkout on the Amazon Pay hosted page immediately after clicking on the Amazon Pay button. `paymentDetails` is required when using 'ProcessOrder'. `addressDetails` is also required if you use 'ProcessOrder' with `productType` set to 'PayAndShip'
signInReturnUrl Type: string	Amazon Pay will redirect to this URL after the buyer signs in Note: In the Live environment, URLs must use HTTPS protocol. The URL domain must be added to Seller Central. See Add domains to Seller Central for more information. In the Sandbox environment, you don't need an SSL certificate and can use the HTTP protocol if you're testing on localhost (http://localhost). You don't need to add URLs to the JavaScript Origins in SellerCentral
signInCancelUrl Type: string	Sign-in cancellation URL provided by the merchant. Amazon Pay will redirect to this URL if the buyer cancels sign-in on the Amazon hosted page

Parameter	Description
name	Request access to buyer name
email	Request access to buyer email address
postalCode	Request access to buyer default shipping address postal code and country code
shippingAddress	Request access to buyer default shipping address
billingAddress	Request access to buyer default billing address
phoneNumber	Request access to buyer default billing address phone number

Parameter	Description
merchantId (required) Type: string	Amazon Pay merchant account identifier
publicKeyId (required) Type: string	Credential provided by Amazon Pay. See Get you publicKeyId for more info You must also set the `sandbox` parameter if your `publicKeyId` does not have an environment prefix
createCheckoutSessionConfig (required) Type: buttonConfig	Create Checkout Session configuration. This is a required field if you use PayAndShip or PayOnly `productType`
placement (required) Type: string	Placement of the 'Sign in with Amazon' 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 'PaymentMethodList' - A list of available payment methods, displayed in checkout or in the payment method section of your site 'Onboarding' - Displayed after the buyer signs in to your site 'Other' - Any page that doesn't fit the previous descriptions
ledgerCurrency (required) 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'
productType Type: string	Product type selected for checkout Supported values: 'SignInAndSetup' - Offer Amazon Sign-in & Setup. Select this product type if you need the buyer to create an account and sign in to your app or website. The buyer will consent to share their information and save Amazon Pay for purchases.
buttonColor Type: string	Color of the 'Sign in with Amazon' button Supported values: 'Gold', 'LightGray', 'DarkGray' Default value: 'Gold'
checkoutLanguage 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'
sandbox 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