You can display store credit as a payment method at checkout. After you issue store credit to a customer, they can apply their store credit at checkout when logged in to your online store through customer accounts.
Store credit is activated on your store by default. You can manage whether to display store credit as a payment method from the Customer accounts settings of your Shopify admin.
To manage whether store credit displays as a payment method, a staff member must have the Store credit staff permission. Learn more about managing staff accounts.