> 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  |


---

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