If you are looking for the source code, all it does is redirect users to the google account login page if they do not have the latest software and only allows users with the new phone to pay via google pay…
Google will only let you use google pay on your pixel 3 if you have an old phone that supports it or has updated to the newest software.
Google Pay is a payment system that allows you to pay for groceries, gas, and tickets with your phone. Google Pay can be used by anyone who owns a Pixel 3 or older phone. If you have an old phone that doesn’t support Google Pay, it won’t work with the Pixel 3 and other new phones like the Huawei Mate 20 Pro.
If you’re not sure what type of phone you have, follow this link: https://support-us-en_us/articles?id=1044&anchor=trouble-with-google%20pay%20on%20my%20pixel%203.
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