as far as the timeout goes, have you overridden your checkout_process.php file? i would think that is where the timeout is happening, specifically here:
https://github.com/zencart/zencart/b...ss.php#L28-L39
do you have this file:
/YOUR_STORE_ROOT/includes/modules/Gray157b/checkout_process.php
if you do great. if not copy it from here:
/YOUR_STORE_ROOT/includes/modules/checkout_process.php
to the above location. you can then change your slamming_threshold to something like 15, and see if that helps.
as far as square_webpay, i see no problems.
hope that helps!
best.