The solution in the other thread amounts to adding a link from the EE3 checkout page to square.com. The broken link was for a blank plugin to hold a custom function (like the function in the gist). You can follow this guide if you need help with creating a blank plugin:
You might try the Flexible payments method add-on for EE4, which will allow you to display instructions on how to pay using Square (and this will involve no coding on your part).
Our Square Payment Gateway is now available. For more details about that click this link: Accept Event Payments with Square using Credit Cards, Google Pay, and Apple Pay
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