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Receipt Verification for IAP Apps

The Receipt Verification Service (RVS) enables validation of purchases made by your app's users.

RVS overview

The following image shows the purchase workflow with receipt verification. RVS starts after the IAP API completes the purchase and returns the purchase receipt to the app.

The steps in the following table match the callouts in the diagram above:

Step Component Task
1 IAP API IAP API interacts with the user to complete the purchase. IAP API returns a purchase receipt to the App.
2 App App forwards the purchase receipt to the App Server.
3 App server App server sends a request to RVS server for validation of the receipt.
4 RVS server RVS server confirms that the receipt is valid.
5 App server App server makes the content available to the user.

You can also use RVS to enable access to a subscription purchased on another platform, such as your website, as long as the purchase was made through Amazon. The following scenario describes this workflow:

  1. Your app's user purchases a subscription through Amazon via your company's website.
  2. Your app receives a receipt for the purchased subscription
  3. To enable access, your app then sends information from the receipt to your server. Finally, your server validates this transaction by querying RVS.

Set up RVS

RVS provides two environment options, depending on whether your app is in the development/testing stage or has been published to the Amazon Appstore:

  • RVS Cloud Sandbox: While developing and testing your app, use an RVS Sandbox environment to verify receipts generated by the App Tester testing tool. To set up an RVS Cloud Sandbox, see Use RVS Cloud Sandbox.
  • RVS production server: After you publish your app to the Amazon Appstore, you can use the Amazon RVS production server. See Instructions for RVS Production Environment.

RVS request syntax

Use RVS to validate the PurchaseResponse object, or the PurchaseUpdatesResponse object. From these response objects, you can extract a UserId, which denotes a unique identifier of the user. The PurchaseResponse object contains a ReceiptId, which is used in conjunction with the UserId to perform an out-of-band server-side validation of the purchase. Requests from your server require a shared secret to be passed to confirm your identity for security.

These requests use the following format:

<Protocol>//<Server>[/<sandbox>]/version/<Operation_version_number>/verifyReceiptId/developer/<Shared_Secret>/user/<UserId>/receiptId/<ReceiptId>

The terms in angle brackets are the request parameters, replace them with the following values for the transaction being verified:

  • Protocol: Protocol being used to communicate with the server or sandbox, such as https:.
  • Server: URL for the RVS server that you are communicating with.
    • Both the RVS Cloud Sandbox server and the RVS production server use the URL "appstore-sdk.amazon.com".
  • sandbox: If you are using the RVS Cloud Sandbox server, use the value "sandbox". If you are using the RVS production server, omit this parameter.
  • Operation_version_number: Version number of the verifyReceiptId operation. This version number is independent of the IAP version number. The current verifyReceiptId version number is "1.0".
  • Shared_secret: Shared secret used to identify the developer issuing the request. Your shared secret can be found on the Shared Key page for your developer account with the Amazon Appstore: https://developer.amazon.com/sdk/shared-key.html. For the RVSSandbox, the Shared Secret can be any non-empty string.
  • UserId: ID representing a distinct Amazon customer for your Appstore app: PurchaseResponse.getUserData().getUserId().
  • ReceiptId: Unique ID for the purchase: PurchaseResponse.getReceipt().getReceiptId() or PurchaseUpdatesResponse.getReceipts()Receipt.getReceiptId().

RVS response syntax

RVS provides a RESTful JSON API interface. As a best practice, use a JSON parser class for reading the JSON responses from the RVS server.

After making a request to verify a transaction, the RVS server or sandbox returns a response code indicating if the request was successful. If successful, the returned JSON response includes information about the transaction.

The following example shows a successful response:

   {
    "autoRenewing":false,
    "betaProduct":false,
    "cancelDate":null,
    "cancelReason":null,
    "freeTrialEndDate":null,
    "gracePeriodEndDate":null,
    "parentProductId":null,
    "productId":"com.amazon.iapsamplev2.gold_medal",
    "productType":"CONSUMABLE",
    "purchaseDate":1399070221749,
    "purchaseMetadataMap":null,
    "quantity":1,
    "receiptId":"wE1EG1gsEZI9q9UnI5YoZ2OxeoVKPdR5bvPMqyKQq5Y=:1:11",
    "renewalDate":null,
    "term":null,
    "termSku":null,
    "testTransaction":true
    }

RVS response codes

The Receipt Verification Service responds with one of the following codes, which indicate the result of the validation check:

Response Code Description
HTTP 200 Success: The Receipt ID, User ID, and shared secret are all valid. Product Type is one of: "ENTITLED", "CONSUMABLE", or "SUBSCRIPTION"
HTTP 400 The transaction represented by this receiptId is invalid, or no transaction was found for this receiptId.
HTTP 410 The transaction represented by this receiptId is no longer valid. Treat it as a canceled receipt.
HTTP 429 The request was throttled. Reduce your calling rate and retry after some time.
HTTP 496 Invalid sharedSecret
HTTP 497 Invalid User ID
HTTP 500 There was an Internal Server Error

RVS response fields for successful transactions

The following table lists and describes the fields included in an RVS response for a successful transaction:

Field Data Type Description
autoRenewing Boolean Indicates if customer's subscription will auto renew.
betaProduct Boolean Indicates whether the product purchased is a Live App Testing product.
cancelDate Long integer The date the purchase was canceled, or the subscription expired. The field is null if the purchase was not canceled. Time is in milliseconds.
cancelReason Integer Indicates why a product was canceled. Possible values are null, 0, 1, or 2, where each integer represents a cancellation reason:
null - The purchase was not canceled.
0 - The cancel reason is currently unavailable and will render at a later time.
1 - Your customer canceled the order.
2 - The purchase was canceled by Amazon's system (For example, a customer purchases a subscription with invalid payment and the purchase could not be completed in the grace period).
freeTrialEndDate Long integer Indicates that the subscription is in a free trial. Provides the free trial end date of the subscription in epoch (milliseconds). The field is null if the subscription is not in a free trial period.
gracePeriodEndDate Long integer Indicates that the subscription is in grace period. Provides the grace period end date of the subscription in epoch (milliseconds). The field is null if the subscription is not in a grace period.
parentProductId String Null. Reserved for future use.
productId String The SKU that you defined for this item in your app.
productType String Type of product purchased. Valid product types are CONSUMABLE, SUBSCRIPTION, and ENTITLED.
purchaseDate Long integer The date of the purchase, stored as the number of milliseconds since the epoch. For subscription items, purchaseDate represents the initial purchase date, not the purchase date of subsequent renewals.
purchaseMetadataMap Map Reserved for future use. Always null. Returned in production only.
quantity Integer Quantity purchased. Always null or 1.
receiptId String Unique identifier for the purchase.
renewalDate Long integer The date that a subscription purchase needs to be renewed. The date is stored as the number of milliseconds since the epoch.
term String Duration that a subscription IAP will remain valid (the term starts on the date of purchase). The term consists of a number and a time period (Day, Week, Month, Year), such as 1 Week or 2 Months.
termSku String Unique SKU that corresponds to the subscription term.
testTransaction Boolean Indicates whether this purchase was made as a part of Amazon's publishing and testing process.

Cancel date and renewal date

The renewalDate field contains the date that an auto-renew subscription purchase next needs to be renewed. This field applies to subscription purchases only. If a customer has a monthly subscription, the subscription renews monthly on the same date the customer first subscribed. In the case where the next month does not include the exact date, the renewal date is the closest prior date. For example:

  • If a customer subscribed on January 2, the next three renewal dates are February 2, March 2, and April 2.
  • If a customer subscribed on January 31, the next three renewal dates are February 28 (or February 29 if it is a leap year), March 31, and April 30.

The cancelDate field contains the date that a subscription purchase expired or that Amazon customer service canceled the purchase. The cancel date represents the date when the customer lost access to the content. When a customer cancels their subscription by turning off auto-renew, the cancel date is when the renewal date would have been.

The renewalDate and cancelDate fields are stored as time in milliseconds. You can use java.util.Date(timeInMillis) to convert the value into a date object.

Consumable or entitlement purchase

In a valid receipt, the cancel date and renewal date both contain the null value. If the cancel date field is not null, it contains the date that Amazon customer service canceled the purchase.

Subscription purchase

In a valid subscription receipt, the cancel date is null. If the cancelDate field is not null, it contains the date that the subscription expired, or that Amazon customer service canceled the purchase.

The renewalDate field contains the date that an auto-renew subscription purchase next needs to be renewed. The field value will be null if the subscription is not set to auto-renew.

In the following example, the user has a subscription that was canceled:

  • The subscription was active from 2016/01/01 – 2016/03/01. In this receipt, the purchaseDate for this subscription is set to 2016/01/01, and the cancelDate is set to 2016/03/01.
  • If this subscription is subsequently reactivated on 2016/04/01, the subscription will have a second receipt. The second receipt will show a purchaseDate of 2016/04/01 and a cancelDate of null.

RVS sandbox and production examples

See RVS Examples.


Last updated: Feb 18, 2022