Integrate store credit feature in your online web store with WooCommerce Store Credit extension. Customers can add credit to their account and can use that credit to make purchases later on. The left out credit can be used later on for further purchases. It is a nice add-on to encourage customers to buy more products as it adds convenience for the users.
This is the EXACT same plugin as distributed by the developer on WooCommerce. The developers’ links are provided above.