Customer Support subscriptions include support credits you can use across any servers you have in your account. You can order Customer Support credits in 4, 8, or 16 credit increments, which costs respectively $95 monthly, $180 monthly, or $340 monthly. Customer Support credits also accumulate (or roll over) every month and remain in your account until they are used.
Server Support subscriptions include support credits you can use on a single dedicated server. You can order Server Support credits in 4, 8, or 16 credit increments, which costs respectively $60 monthly, $110 monthly, or $200 monthly. In contrast to Customer Support subscriptions, Server Support credits do not accumulate. Instead, the number of credits available gets reset to the amount you ordered at the beginning of the month.
One support credit is equivalent to 15 minutes of work. If you do not purchase one of the subscription packages detailed above, support credits will be added to your invoice and are billed at the rate of 1 credit = $25.