Credit cards should now be displaying as accepted form of payment on all listings that have square set up as an option. If you see anywhere that it's missing, please post a link to that page/location.
I have not yet separated the checks/money order options as that's a bigger task that I'll have to modify & test on development server before it can safely go live.
Regarding the customer who was unable to enter credit card info ...
I am not 100% certain, but I may have found the cause. There is a bit of a glitch involving the vacation settings that disables some checkout functionality through the personal stores when vacation set to the on position regardless of vacation expiration settings. I noticed your store had vacation set to on, but that the end date was expired, which should automatically turn vacation mode restrictions off, but one was left on.
I have to fix that yet & will try to get it done this week, but in the mean time, I have explicitly turned it off & I'm hoping that clears any further issues.
If it happens again, please alert.