Ok so had my site upgrade to 1.57c and now im getting the SQ_NONCE FAILURE error again. i noticed this error message....


ERROR: module not loaded due to missing language file:
/public_html/includes/languages/english/modules/payment/square_handler.php

when i tried to check to see if i could perhaps set it to uk only and that would allow it to suddenly work. no joy, just happened to spot this message so i goes to insert the missing file and it is indeed missing, the error is still there and the settings options dissapeared from the admin panel.
deleting square_handler.php gets those settings back in the admin panel?

i havent tried implementing the SCA patch as above as developers i hired for upgrade left my site in a sorry state and ive had to let them go