The Clearing Plugin Pair table defines rules which affect clearing logic and validation.
For example, the Allowed with Order Approval checkbox defines that the selected clearing plugin can be used with the order approval process. The Allowed Cancelling Orders checkbox defines that the clearing plugin can be used with the cancelling & editing orders feature.
If you choose to hide prices/billing address for groups of a specific store (in Store Setup > Permissions tab), make sure you have at least one clearing method which is marked as allowed in the Clearing Plugin Pair table, otherwise there may be no available clearing option in the store.
