Verify & complete checkout

[Step 6 of 11] The buyer is redirected to checkoutResultReturnUrl after Amazon Pay has processed the transaction. The Amazon Pay checkout session ID will be included as a query parameter.

In this step, you will use the checkout session ID to confirm that the buyer has successfully returned to your site and finalize the paymentIntent. At the end of this step, you will be able to present the buyer with the checkout result.

1. Complete Checkout Session
2. Add shipment tracking info

1. Complete Checkout Session

Use Complete Checkout Session to confirm that the buyer has successfully returned to your site. The chargeAmount in the request must match the Checkout Session object paymentDetails.chargeAmount to verify order amount.

Note: Amazon Pay will not finalize the paymentIntent until you confirm checkout with Complete Checkout Session. Any Checkout Session that is not confirmed within 24 hours will be cancelled. If payment authorization was requested it will also be cancelled.

Successful response:

Complete Checkout Session will return a success response if the transaction was processed successfully. Implement the guidance that corresponds to the Checkout Session paymentIntent:

paymentIntent	Description
AuthorizeWithCapture	Payment has been authorized and captured. 1. Store the `ChargeId` - You must store the `ChargeId` to process refunds. 2. Store the `ChargePermissionId` - Store the `ChargePermissionId` for future payments. For recurring Charge Permissions, see managing recurring payments for more information. You can also use the `ChargePermissionId` to retrieve buyer and transaction info after checkout.
Authorize	Payment has been authorized. 1. Store the `ChargeId` - You must store the ChargeID for deferred payment capture. See deferred transactions for more info. 2. Store the `ChargePermissionId` - Store the `ChargePermissionId` for future payments. For recurring Charge Permissions, see managing recurring payments for more information. You can also use the `ChargePermissionId` to retrieve buyer and transaction info after checkout.
Confirm	Payment has not been authorized or captured. 1. Store the `ChargePermissionId` - Store the `ChargePermissionId` for future payments. For recurring Charge Permissions, see managing recurring payments for more information. Otherwise, see manage deferred payments. You can also use the `ChargePermissionId` to retrieve buyer and transaction info after checkout.

Error response:

Complete Checkout Session will return an error response for failed transactions. The buyer either canceled checkout or was unable to provide a valid payment instrument. You should:

Redirect the buyer to the start of checkout
Display a message such as: "Your payment was not successful. Please try another payment method.“

Request


curl "https://pay-api.amazon.com/:version/checkoutSessions/:checkoutSessionId/complete" \

-X POST

-H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"

-H "x-amz-pay-date:20201012T235046Z"

-d @request_body


curl "https://pay-api.amazon.com/:environment/:version/checkoutSessions/:checkoutSessionId/complete" \

-X POST

-H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"

-H "x-amz-pay-date:20201012T235046Z"

-H "x-amz-pay-idempotency-key:AVLo5tI10BHgEk2jEXAMPLEKEY"

-d @request_body

Request body

{
    "chargeAmount": {
        "amount": "14.00",
        "currencyCode": "USD"
    }
}

Request parameters

Name	Location	Description
checkoutSessionId (required) Type: string	Path parameter	Checkout Session identifier
chargeAmount (required) Type: price	Body	Transaction amount

Sample Code

<?php

    include 'vendor/autoload.php';
    $amazonpay_config = array(
        'public_key_id' => 'YOUR_PUBLIC_KEY_ID',
        'private_key'   => 'keys/private.pem', // Path to RSA Private Key (or a string representation)
        'region'        => 'YOUR_REGION_CODE',
        'algorithm'     => 'AMZN-PAY-RSASSA-PSS-V2'
    );

    $payload = array(
        'chargeAmount' => array(
            'amount' => '14.00',
            'currencyCode' => 'USD'
        )
    );

    try {
        $client = new Amazon\Pay\API\Client($amazonpay_config);
        $result = $client->completeCheckoutSession('bd504926-f659-4ad7-a1a9-9a747aaf5275', $payload);
        
        if ($result['status'] === 202) {
            // Charge Permission is in AuthorizationInitiated state
            $response = json_decode($result['response'], true);
            $checkoutSessionState = $response['statusDetails']['state'];
            $chargeId = $response['chargeId'];
            $chargePermissionId = $response['chargePermissionId'];
        } 
        else if ($result['status'] === 200) {
            $response = json_decode($result['response'], true);
            $checkoutSessionState = $response['statusDetails']['state'];
            $chargePermissionId = $response['chargePermissionId'];
        } else {
            // check the error
            echo 'status=' . $result['status'] . '; response=' . $result['response'] . "\n";
        }
    } catch (Exception $e) {
        // handle the exception
        echo $e;
    }
?>

using Amazon.Pay.API.Types;
using Amazon.Pay.API.WebStore;
using Amazon.Pay.API.WebStore.Types;
using Amazon.Pay.API.WebStore.CheckoutSession;

public class Sample
{
    public WebStoreClient InitiateClient()
    {
        // set up config
        var payConfiguration = new ApiConfiguration
        (
            region: Region.YOUR_REGION_CODE,
            publicKeyId: "YOUR_PUBLIC_KEY_ID",
            privateKey: "PATH_OR_CONTENT_OF_YOUR_PRIVATE_KEY",
            algorithm: AmazonSignatureAlgorithm.V2
        );

        // init API client
        var client = new WebStoreClient(payConfiguration);

        return client;
    }

    public CheckoutSessionResponse CompleteCheckoutSession(string checkoutSessionId)
    {
        // prepare the request
        var request = new CompleteCheckoutSessionRequest(14.00M, Currency.USD);

        // send the request
        var result = client.CompleteCheckoutSession(checkoutSessionId, request);

        // check if API call was successful
        if (!result.Success)
        {
            // do something, e.g. throw an error
        }

        return result;
    }
}

import com.amazon.pay.api.AmazonPayResponse;
import com.amazon.pay.api.PayConfiguration;
import com.amazon.pay.api.WebstoreClient;
import com.amazon.pay.api.exceptions.AmazonPayClientException;
import com.amazon.pay.api.types.Region;

import org.json.JSONObject;

public void sample() {
    PayConfiguration payConfiguration = null;
    try {
        payConfiguration = new PayConfiguration()
            .setPublicKeyId("YOUR_PUBLIC_KEY_ID")
            .setRegion(Region.YOUR_REGION_CODE)
            .setPrivateKey("YOUR_PRIVATE_KEY")
            .setAlgorithm("AMZN-PAY-RSASSA-PSS-V2");

        WebstoreClient webstoreClient = new WebstoreClient(payConfiguration);
        AmazonPayResponse response = null;
        String checkoutSessionId = "bd504926-f659-4ad7-a1a9-9a747aaf5275";

        JSONObject payload = new JSONObject();

        JSONObject chargeAmount = new JSONObject();
        chargeAmount.put("amount", "14.00");
        chargeAmount.put("currencyCode", "USD");
        payload.put("chargeAmount", chargeAmount);

        response = webstoreClient.completeCheckoutSession(checkoutSessionId, payload);
        String chargePermissionId = response.getResponse().getString("chargePermissionId");
    } catch (AmazonPayClientException e) {
        e.printStackTrace();
    }
}

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

const config = {
    publicKeyId: 'YOUR_PUBLIC_KEY_ID',
    privateKey: fs.readFileSync('tst/private.pem'),
    region: 'YOUR_REGION_CODE',
    algorithm: 'AMZN-PAY-RSASSA-PSS-V2' 
};    
                
const payload = {
    chargeAmount: {
        amount: "14.00",
        currencyCode: "USD"
    }
};
                        
const testPayClient = new Client.WebStoreClient(config);
const response = testPayClient.completeCheckoutSession('bd504926-f659-4ad7-a1a9-9a747aaf5275', payload);

response.then(function (result) {
    console.log(result.data);
}).catch(err => {
    console.log(err);
});

<?php

    include 'vendor/autoload.php';
    $amazonpay_config = array(
        'public_key_id' => 'YOUR_PUBLIC_KEY_ID',
        'private_key'   => 'keys/private.pem', // Path to RSA Private Key (or a string representation)
        'region'        => 'YOUR_REGION_CODE',
        'sandbox'       => true,
        'algorithm'     => 'AMZN-PAY-RSASSA-PSS-V2'
    );

    $payload = array(
        'chargeAmount' => array(
            'amount' => '14.00',
            'currencyCode' => 'USD'
        )
    );

    try {
        $client = new Amazon\Pay\API\Client($amazonpay_config);
        $result = $client->completeCheckoutSession('bd504926-f659-4ad7-a1a9-9a747aaf5275', $payload);
        
        if ($result['status'] === 202) {
            // Charge Permission is in AuthorizationInitiated state
            $response = json_decode($result['response'], true);
            $checkoutSessionState = $response['statusDetails']['state'];
            $chargeId = $response['chargeId'];
            $chargePermissionId = $response['chargePermissionId'];
        } 
        else if ($result['status'] === 200) {
            $response = json_decode($result['response'], true);
            $checkoutSessionState = $response['statusDetails']['state'];
            $chargePermissionId = $response['chargePermissionId'];
        } else {
            // check the error
            echo 'status=' . $result['status'] . '; response=' . $result['response'] . "\n";
        }
    } catch (Exception $e) {
        // handle the exception
        echo $e;
    }
?>

using Amazon.Pay.API.Types;
using Amazon.Pay.API.WebStore;
using Amazon.Pay.API.WebStore.Types;
using Amazon.Pay.API.WebStore.CheckoutSession;

public class Sample
{
    public WebStoreClient InitiateClient()
    {
        // set up config
        var payConfiguration = new ApiConfiguration
        (
            region: Region.YOUR_REGION_CODE,
            environment: Environment.Sandbox,
            publicKeyId: "YOUR_PUBLIC_KEY_ID",
            privateKey: "PATH_OR_CONTENT_OF_YOUR_PRIVATE_KEY",
            algorithm: AmazonSignatureAlgorithm.V2
        );

        // init API client
        var client = new WebStoreClient(payConfiguration);

        return client;
    }

    public CheckoutSessionResponse CompleteCheckoutSession(string checkoutSessionId)
    {
        // prepare the request
        var request = new CompleteCheckoutSessionRequest(14.00M, Currency.USD);

        // send the request
        var result = client.CompleteCheckoutSession(checkoutSessionId, request);

        // check if API call was successful
        if (!result.Success)
        {
            // do something, e.g. throw an error
        }

        return result;
    }
}

import com.amazon.pay.api.AmazonPayResponse;
import com.amazon.pay.api.PayConfiguration;
import com.amazon.pay.api.WebstoreClient;
import com.amazon.pay.api.exceptions.AmazonPayClientException;
import com.amazon.pay.api.types.Environment;
import com.amazon.pay.api.types.Region;

import org.json.JSONObject;

public void sample() {
    PayConfiguration payConfiguration = null;
    try {
        payConfiguration = new PayConfiguration()
            .setPublicKeyId("YOUR_PUBLIC_KEY_ID")
            .setRegion(Region.YOUR_REGION_CODE)
            .setPrivateKey("YOUR_PRIVATE_KEY")
            .setEnvironment(Environment.SANDBOX)
            .setAlgorithm("AMZN-PAY-RSASSA-PSS-V2");

        WebstoreClient webstoreClient = new WebstoreClient(payConfiguration);
        AmazonPayResponse response = null;
        String checkoutSessionId = "bd504926-f659-4ad7-a1a9-9a747aaf5275";

        JSONObject payload = new JSONObject();

        JSONObject chargeAmount = new JSONObject();
        chargeAmount.put("amount", "14.00");
        chargeAmount.put("currencyCode", "USD");
        payload.put("chargeAmount", chargeAmount);

        response = webstoreClient.completeCheckoutSession(checkoutSessionId, payload);
        String chargePermissionId = response.getResponse().getString("chargePermissionId");
    } catch (AmazonPayClientException e) {
        e.printStackTrace();
    }
}

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

const config = {
    publicKeyId: 'YOUR_PUBLIC_KEY_ID',
    privateKey: fs.readFileSync('tst/private.pem'),
    region: 'YOUR_REGION_CODE',
    sandbox: true,
    algorithm: 'AMZN-PAY-RSASSA-PSS-V2' 
};    
                
const payload = {
    chargeAmount: {
        amount: "14.00",
        currencyCode: "USD"
    }
};
                        
const testPayClient = new Client.WebStoreClient(config);
const response = testPayClient.completeCheckoutSession('bd504926-f659-4ad7-a1a9-9a747aaf5275', payload);

response.then(function (result) {
    console.log(result.data);
}).catch(err => {
    console.log(err);
});

Response

{
    "checkoutSessionId": "bd504926-f659-4ad7-a1a9-9a747aaf5275",
    "webCheckoutDetails": null,
    "chargePermissionType": "Recurring",   
    "recurringMetadata": null,
    "productType": null,
    "paymentDetails": null,
    "merchantMetadata": null,
    "supplementaryData":null, // Amazon Pay system data 
    "buyer": null,
    "billingAddress": null,
    "paymentPreferences": [
        null
    ],
    "statusDetails": {
        "state": "Completed",
        "reasonCode": null,
        "reasonDescription": null,
        "lastUpdatedTimestamp": "20191015T204327Z"
    },
    "shippingAddress": null,
    "platformId":null,
    "chargePermissionId": "S01-5105180-3221187",
    "chargeId": "S01-5105180-3221187-C056351",
    "constraints": [
        null
    ],
    "creationTimestamp": "20191015T204313Z",
    "expirationTimestamp": "20191016T204313Z",
    "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
    "deliverySpecifications": null,
    "providerMetadata": null,
    "checkoutButtonText": null,
    "releaseEnvironment": null
}

2. Add shipment tracking info

Note: This section is only applicable if you ship packages using a supported carrier.

Send shipment tracking information to Amazon Pay using the Delivery Tracker API. Amazon Pay will notify your buyers on their Alexa device when their package is shipped and when their package is delivered. See setting up delivery notifications for more info.