Still can find no rhyme or reason for the 239 error (in the current GitHub version)

Since the 20th of June, the site has had 273 successful payments with WebPay.

Still, during the same period,
Code:
[27-Jun-2022 21:03:42 UTC] PHP Notice: missing token result: check if card button is disabled on dev console using: document.getElementById('card-button'); else look for javascript error in console. in /includes/modules/payment/square_webPay.php on line 239
reared its ugly head only 15 times and I have not been able to catch anything in the consol.