# 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 <a href="https://knowledgecenter.zuora.com/Zuora_Billing/Bill_your_customers/Bill_for_usage_or_prepaid_products/Advanced_Consumption_Billing/Prepaid_with_Drawdown" target="_blank">Prepaid with Drawdown</a>.


## Reverse fund rollover

 - [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 work if the associated prepayment charge has rollover enabled.

## Trigger fund rollover

 - [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 API reference describes how to manually trigger fund rollover from source validity period to destination validity period. There are no path or query parameters.

Note: This API will not work if rollover is enabled in the associated prepayment charge. If you want to trigger rollover automatically, see Create prepayment charge with rollover for more information.

## Deplete funds

 - [POST /v1/prepaid-balance-funds/deplete](https://developer.zuora.com/v1-api-reference/api/prepaid-with-drawdown/depletefunds.md): Depleting a prepaid balance fund enables you to expire the remaining balance, which can be recognized by revenue. When an expiry request is received, the remaining fund balance is reduced to zero, and the related objects like PrepaidBalance, ValidityPeriodSummary, PrepaidBalanceTransaction, and DailyConsumption will be updated.