> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/sdks-and-tools/universal-sdk-documentation/android/appendices/appendix-e-google-wallet-smart-tap-vas.md).

# Appendix E - Google Wallet Smart Tap VAS

These instructions are for preparing Google Wallet Smart Tap VAS (value-added service) transactions.

## Mobile Device

* Configure the mobile device for Google Wallet Smart Tap Pass.

## Load Key

* Load the LTPK protection key (Long Term Private Key) into the MagTek device.
* Upload a Public Key to the Google Pay & Wallet Console for the issuer account associate with the Google Wallet Pass.

## Collector ID Slots

* Set the Google Smart Tap Collector ID property for each slot 1 to 6 using `IDeviceControl à setConfigInfo()`.

## POS Capabilities

* Set the POS capabilities property using `IDeviceControl à setConfigInfo()`.

## Start Transaction

* Set the `PaymentMethods` to include `PaymentMethod.GoogleVAS`.
* Set `AppleVASMode` to: `VASMode.Single`, `VASMode.Dual`, or `VASMode.VASOnly`.

## Transaction Response

* Data from a Google Wallet Smart Tap (`DF7B`) is returned in separate Collector ID slot containers associated with the Google Wallet Pass.

| Tag       | Length | Value / Description           |
| --------- | ------ | ----------------------------- |
| `FF41`    | var    | Google Smart Tap Container    |
| `//FF01`  | var    | Collector ID Slot 1 Container |
| `///DF7B` | var    | Service Response NDEF Record  |
| `//FF02`  | var    | Collector ID Slot 2 Container |
| `///DF7B` | var    | Service Response NDEF Record  |
| `//FF03`  | var    | Collector ID Slot 3 Container |
| `///DF7B` | var    | Service Response NDEF Record  |
| `//FF04`  | var    | Collector ID Slot 4 Container |
| `///DF7B` | var    | Service Response NDEF Record  |
| `//FF05`  | var    | Collector ID Slot 5 Container |
| `///DF7B` | var    | Service Response NDEF Record  |
| `//FF06`  | var    | Collector ID Slot 6 Container |
| `///DF7B` | var    | Service Response NDEF Record  |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://developer.magtek.com/sdks-and-tools/universal-sdk-documentation/android/appendices/appendix-e-google-wallet-smart-tap-vas.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.