Postpaid is convenient to expand capacity online or change configuration according to business conditions and flexible planning, while Prepaid offers better prices when the business size is relatively stable.

In order to facilitate users to switch the charging method of Baidu AI Cloud database DocDB for MongoDB instance, Baidu AI Cloud has launched the charging change function, which supports the mutual switching between post-payment and prepayment instances. In other words, the charging DocDB for MongoDB instance based on demand can be converted into annual or monthly billing, which can also be converted into on-demand billing. Refer to the Billing Change introduction in the operation guide for specific operations.