When you choose a Website as a Service plan, you'll receive an email with a link to your terms and agreement. Clicking that link will take you to a customer checkout. This is a fully secure, custom checkout page with the payment plan amount and details listed.
You'll be asked to enter your payment method details, agree to the terms and conditions and type your name in a digital signature box to complete checkout and initiate the payment plan.
All future payments will be timed and automated according to the custom terms of your payment plan.