This is all what you have to do. :) When you purchase credits, it’ll be using bought credit and your site will be up and running. You have just to make sure you have all time enough credit to cover your resources usage.

Hello, @Unheard

In order to make sure you service wont be suspended or cancelled you need to have a valid payment method added to your account (credit/debit card) or add some fund using PayPal.

Hope this helps!

Regards,
Alex