Services are billed on a monthly basis except for SSL certificates, which are billed yearly. Some addons, like VCL purchases from third party sellers, are billed once only. When you decide to load balance across multiple nodes, the total billed equals the total number of locations you picked times the monthly cost for one Cachoid. For example, if you sign up for the Medium plan ($15/mo) and choose to load balancer across two locations for your domain example.com , the total monthly recurring is going to be $30 (2x $15).
You can review invoices and transactions in your Billing section at https://app.cachoid.com/billings.
We are currently using Stripe and Paypal for transaction processing. In our database,we store the basic Stripe and Paypal information and the last 4 digits of your credit card. Besides the last 4 digits of your credit card, we do NOT store credit card expiration date, credit card numbers, or the CVC. Stripe and/or PayPal handles this data for us per your authorization.