Amazon Pay

Amazon Pay is a service that lets your customers use the payment methods already associated with their Amazon account to make payments for goods or services. To make a payment, they can use any of the payment methods on file in their Amazon account.

Summary

The necessary operations to integrate Amazon Pay are:

Sign in on Amazon Pay SellerCentral
Set the right parameters on Amazon Pay
Use Amazon Pay credentials to set up your Gestpay account, first in sandbox then in production
Integrate Amazon Pay button in the list of the available payment methods on your website, to agree with Amazon
Execute the encryption of the data and call the payment page
Read of the result and decrypt of the response
If you’re using Amazon Pay with the shipping address selection mode, you have to read the shipping and billing address by calling CallReadTrxS2S

To use Amazon Pay you must register and follow the instructions.

Then, you have to retrieve a clientID by creating an Application.

Configure Amazon Pay

To communicate with Gestpay sandbox and production environments, You need to set some parameters in the Amazon Pay profile.

In the IPN Configuration you must set these fields:

Sandbox
merchant URL	If you want to receive notifications directly from Amazon, here you can set a personalized URL
integrator URL	`https://sandbox.gestpay.net/pagam/AmazonPayNotification.aspx`

Production
merchant URL	If you want to receive notifications directly from Amazon, here you can set a personalized URL
integrator URL	`https://ecomm.sella.it/pagam/AmazonPayNotification.aspx`

In Login with Amazon > Web Settings section insert the follwing values:

Sandbox
Allowed Javascript Origins	`https://sandbox.gestpay.net`
Allowed Return URLs	`https://sandbox.gestpay.net/pagam/AmazonPay.aspx`

Production
Allowed Javascript Origins	`https://ecomm.sella.it`
Allowed Return URLs	`https://ecomm.sella.it/pagam/AmazonPay.aspx`

Gestpay Configuration

In Gestpay backoffice, insert Amazon Pay credentials received when signedd in:

The Show Address Widget checkbox allows the selection of the address from Amazon Pay during the payment by showing the widget; This setting can be disabled if the merchant sells non-shippable items (e.g. non physical goods).

Amazon Pay payment flow

To use Amazon Pay:

start the payment process by calling Encrypt with mandatory data
redirect the user to the payment page, passing the CryptDecryptString received in response.
Gestpay will call the merchant’ Positive (or Negative) Response URL to acknowledge the status of the transaction; Gestpay will also call the merchant’ Server-to-Server URL. The merchant has to decrypt the parameters and read the transaction status.
To retrieve the buyer’s address, you have to call callReadTrxS2S.

1. Encrypt

The first step is to encrypt the payment request and send it to Gestpay. To do this, you’ll call Encrypt in WsCryptDecrypt webservice.

An Encrypt example is available in our API section.

If you want to use the paymentType tag for this method, the value to use is AMAZONPAY. See the section How to redirect the customer to a payment method to learn how to use the paymentType tag.

With Amazon Pay the ShopTransactionId must be unique.

2. Redirect the user

Gestpay will answer to your request with an EncryptResponse, that will contain a field CryptDecryptString.

For test environment, redirect the user to

http://sandbox.gestpay.net/pagam/pagam.aspx?a=<ShopLogin>&b=<CryptDecryptString>

For production environment, the url is

http://ecomm.sella.it/pagam/pagam.aspx?a=<ShopLogin>&b=<CryptDecryptString>

More info on this can be found in Using gestpay payment page.

Once the buyer is redirected, and if he is not authenticated, Amazon will show a login form:

Once the buyer is logged, he will see a page where he can choose the shipping address from Amazon saved addresses:

Then he can choose a credit card amongst the saved amazon credit cards.

At the end, Gestpay will perform an authorization request on the selected credit card, and the buyer will be redirected to the merchant website (positive or negative response URL).

3. Read response from Gestpay

After the payment has been acknowledged, Gestpay will

redirect the user to the url specified in URL for positive (or negative) response
asynchronously call the URL Server to Server with the transaction data.

This process is described in the docs for the payment page, step 3.

The payload of this call are two query parameters, the first being the shopLogin and the second being a encrypted string.

To decrypt the encrypted string you must call Decrypt in WsCryptDecrypt webservice; in the response you’ll see the transaction result.

4. Get the buyer’ shipping and billing address

To retrieve the buyer’s shipping addresses, you call callReadTrxS2S in WsS2S webservice. There, you’ll find also a response example.

The relevant data is contained in the OrderReferenceDetails tag; here we’ll report an example of the response relevant data:

<callReadTrxS2SResponse xmlns="https://ecomms2s.sella.it/">
  <callReadTrxS2SResult>
    <GestPayS2S xmlns="">
        ...
        <OrderReferenceDetails>
          <OrderReferenceStatus>
              <State>Draft</State>
          </OrderReferenceStatus>
          <OrderLanguage>it-IT</OrderLanguage>
          <Destination>
              <DestinationType>Physical</DestinationType>
              <PhysicalDestination>
                <StateOrRegion>BI</StateOrRegion>
                <Phone>33333333</Phone>
                <City>BIELLA</City>
                <CountryCode>IT</CountryCode>
                <PostalCode>13900</PostalCode>
                <Name>Marco Rossi</Name>
                <AddressLine1>via Gobe 15</AddressLine1>
              </PhysicalDestination>
          </Destination>
          <ExpirationTimestamp>2018-05-13T07:24:02.186Z</ExpirationTimestamp>
          <IdList/>
          <SellerOrderAttributes>
              <SellerOrderId>4354395804398dkfjlhsdfk</SellerOrderId>
          </SellerOrderAttributes>
          <OrderTotal>
              <CurrencyCode>EUR</CurrencyCode>
              <Amount>10.00</Amount>
          </OrderTotal>
          <Buyer>
              <Name>Ale</Name>
              <Email>marco.rossi@email.it</Email>
          </Buyer>
          <ReleaseEnvironment>Sandbox</ReleaseEnvironment>
          <AmazonOrderReferenceId>S02-0319513-4657042</AmazonOrderReferenceId>
          <CreationTimestamp>2017-11-14T07:24:02.186Z</CreationTimestamp>
          <BillingAddress>
              <PhysicalAddress>
                <City>Neunkirchen</City>
                <CountryCode>DE</CountryCode>
                <PostalCode>66538</PostalCode>
                <Name>Liam Barker</Name>
                <AddressLine1/>
                <AddressLine2>Meininger Strasse 58</AddressLine2>
              </PhysicalAddress>
              <AddressType>Physical</AddressType>
          </BillingAddress>
          <RequestPaymentAuthorization>false</RequestPaymentAuthorization>
        </OrderReferenceDetails>
        ...
    </GestPayS2S>
  </callReadTrxS2SResult>
</callReadTrxS2SResponse>