[Google Pixel Watch] bernarbernuli:
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There are several countries in the world that support Google Wallet for contactless payments, here the list of countries supported to use Google Wallet on smartwatch. Google has supported more than 30 countries in the last year, however, users in many countries cannot use Google Wallet because they do not yet have official support for Google Wallet. Although there is a workaround for this, basically it is to bypass Google's verification of the country you are in based on the IP address, which causes Google Wallet app to be hidden in seconds if used in an unsupported country. Therefore, to avoid this you need an IP address of a supported country, for this you use a proxy or a VPN, so you can pay in any country where the merchant has Contactless payment. For a much more extensive info and considerations about the trick enter here, basically the steps to follow are as follows:

Download Permanent Proxy app from this link and install it on the watch. The app is designed for Wear OS devices and allows anyone to use Google Wallet in regions where it is normally blocked.

Go to Settings > system > About and tap "Build number" multiple times until you see a message that says "you are now a developer". Next go to Settings > developer options and enable "ADB debugging" and "Debug over Bluetooth".

Run Permanent Proxy app, it will ask for permissions, accept "always allow".

Now create a personal proxy service that is reliable and avoid changing the IP address frequently, for example in Google Cloud.

Enter the IP address and port of the proxy you created, and enable it. After enabling the VPN/proxy, exit the app, give your watch some time and then check back in the permanent proxy app to see if your external IP has changed to the one you entered as a proxy. If it has, good job, you're connected!

Disable Wi-Fi on the watch. Don't download Google Wallet on your watch. It should enable itself. If it doesn't do it automatically, download Play Sore from Play Store.

Alternative:

An alternative to "Permanent Proxy" is to use a VPN on the phone that routes Internet traffic from the Wear OS app on the phone through it. To make it work you have to disable Wi-Fi on the watch, only use Bluetooth connection and keep the VPN on the phone always on.

On your phone, install a VPN app such as NordVPN, Adguard VPN, Tunnel Bear VPN or any other VPN app you prefer

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In the VPN app you have installed, select and connect to a server in a country that supports Google Wallet, such as the USA.

Disable Wi-Fi on the watch, in a few seconds the app will appear in the list of apps on your watch. Don't download Google Wallet on your watch. It should enable itself. If it doesn't do it automatically, download Play Sore from Play Store.

Open Google Wallet/Google Pay on your watch, complete the setup and add a new card as normal.

Considerations:

Google Wallet app is installed by default on the watch, but it is hidden for the countries without official support. Don't download Google Wallet on your watch. It should enable itself. If you disable Wi-Fi on the watch and start a VPN on your phone, the app should appear in a while.

Proxy services can be found online and can be from any country. However, make sure you completely trust the proxy you chose before you enter it. It is possible that all your watch data will be sent through that proxy, including sensitive data, so act at your own risk. It is recommended that you create your own proxy. This can be easily done using Google Cloud (trial version).

"Permanent proxy" may not work if the watch is connected directly to the Internet (watches with eSIM).

Only bank cards that you can use to pay with your phone in stores can be added to Google Wallet on your watch. This means you will need a card from a country supported by Google Wallet.

You can make your watch refresh its Google Wallet availability check in two ways.: Either by setting the IP/port again in the Permanent Proxy app, or by tapping "Home App" in Settings > System > About > Versions.

Even if you are using "Permanent proxy", sometimes Google Wallet is disabled after update of some related Google apps, Services framework, Play services, Google main app. In this case, manual install of this Google Wallet (Wear OS) app version and after watch restart it appeared again.

Free VPNs may work, but they usually stop working within a couple of days, if they work at all.

If Google Wallet does not work, delete Google Wallet data in the watch settings. Also try to delete updates.

Google Wallet will work if you see the icon in the quick settings of the watch.

"Permanent proxy" only works for IPv4 networks. If you are on a network that uses IPv6, in theory, Google can still verify which country you are in. Turn off Wi-Fi if necessary.

Uninstalling the proxy permanently will not stop the proxy. Stop the proxy using the application before uninstalling it, or stop the proxy using the ADB command below.

adb shell settings delete global http_proxy
adb shell settings delete global global_http_proxy_host
adb shell settings delete global global_http_proxy_port
adb shell settings delete global global_http_proxy_exclusion_list
adb shell settings delete global global_proxy_pac_url
adb shell reboot

For more information, go to the original XDA thread here.

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