<!--
{
  "availability" : [

  ],
  "documentType" : "symbol",
  "framework" : "ApplePayontheWeb",
  "identifier" : "/documentation/ApplePayontheWeb/ApplePayRequestBase/applicationData",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Apple Pay on the Web"
    ],
    "preciseIdentifier" : "instp/ApplePayRequestBase/applicationData"
  },
  "title" : "applicationData"
}
-->

# applicationData

Application-specific data or state you can add to support your app.

```
DOMString applicationData;
```

## Discussion

Use this property for additional data as may be appropriate for your app—for example, a shopping cart identifier or an order number.

The signed payment data (the <doc://com.apple.documentation/documentation/PassKit/PKPaymentToken/paymentData> property of <doc://com.apple.documentation/documentation/PassKit/PKPaymentToken>) includes a hash of this data. You’re responsible for sending the full application data to your server, if needed.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)