# Prepaid with Drawdown

The Prepaid with Drawdown feature is a pricing model for consumption-based services, such as data storage. Under this model, customers pay upfront to receive a number of units, usually for a period of time like a month or a year. Then they consume against that prepayment balance in a use-it-or-lose-it fashion, with a possibility of topping up more units or being charged for any overage. This model strikes a balance between upfront commitment and the pure pay-as-you-go pricing models. For more information, see Prepaid with Drawdown.

 - [POST /v1/ppdd/reverse-rollover](https://developer.zuora.com/v1-api-reference/api/prepaid-with-drawdown/post_reverserollover.md): This REST API reference describes how to manually reverse fund rollover from source validity period to destination validity period. There are no path or query parameters. **Note**: This API will not w
 - [POST /v1/ppdd/rollover](https://developer.zuora.com/v1-api-reference/api/prepaid-with-drawdown/post_rollover.md): Prepaid with Drawdown Rollover enables you to transfer the accumulative carryover of your customers’ prepaid balance funds to the following validity period when using Prepaid with Drawdown. This REST
 - [POST /v1/prepaid-balance-funds/deplete](https://developer.zuora.com/v1-api-reference/api/prepaid-with-drawdown/expireprepaidfunds.md): Depletes prepaid balance funds. A fund is depleted only when it exists, is not deleted, has a balance greater than zero, and its source type is a prepayment fund: charge-based unit funds, upfront curr