The Subscription Settings tab is where you tell the Miva admin how to deal with subscriptions that are in an error state or where there is no inventory to ship.
Retry Failed Subscription Authorizations After: This establishes the number of days that must pass before a failed subscription authorization is tried again. An entry of 0 means it will not be tried again.
Cancel Subscription After: This establishes the number of failed authorizations that must take place before a subscription is canceled outright. An entry of 0 means the subscription will not be canceled.
Out of Stock Handling: This determines how a subscription is handled when the purchased item is out of stock. The options are Process Regardless of Inventory Level or Error and Skip to Next Order Date.
For more information on Subscriptions and how they are handled, visit the Subscriptions document.