Prepaid Xfinity Now internet payment methods

3 questions about payment for Xfinity Now prepaid internet: (please answer any of these individually if you just know part)

1 . Can I make payments using the in store kiosk once the account has been set up?
2 . Can I make a cash payment in the store?
3 Can I pay ahead more than one month at a time? (Prepay for 3 months for example and not pay again til then). Or is it set up to only be able to pay each time for the 1 month ahead?