We are fairly flexible with you. 

Use our service, then after 30 days or so, pay your bill.  You pay your bill by logging into your account and clicking the billing button.  You have option to pay via paypal, credit card, or mail a check to us.  If you forget, we will email you a reminder from time to time.  Accounts that are 60-90 days overdue MAY be frozen by us depending on the situation (whether we are able to contact you etc).