Well, this is crazy, but from the Square Webpay 2.1.1 files from the upload folder of, I reuploaded the files, squareWebpay_handler.php and setJS.php. Then I login to Squareup.com and went and asked for another OAuth code. I installed that, and my shopping cart is back to taking payments again. Why that worked...I don't really know why... But my shopping cart is taking payments now, and I never found a green button this time either.