Credits that are automatically granted to the customer at the beginning of the billing period and automatically expire at the end of the period. These credits may be limited to specific charges.

Example :

The customer pays $1,000 upfront every month, which they can then use for any metric included in their plan. At the end of the billing period, any unused credit is lost.

It is difficult to implement this logic with the current wallet feature because (1) there is no automatic top-up, (2) when credits expire the user needs to create a new wallet and (3) credits cannot be limited to specific charges.

Similar use case with billing units: https://getlago.canny.io/feature-requests/p/periodic-allowance-billing-units