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The store credit configuration controls automatic refunds, the display of available credit in customer accounts, and the email template that is used for notifications sent to customers.
On the Admin sidebar, go to Stores > Settings > Configuration.
In the left panel, expand Customers and choose Customer Configuration.
Expand the Store Credit Options section.
Set Enable Store Credit Functionality to Yes.
Set the following according to your preference:
Show Store Credit History to Customers
Refund Store Credit Automatically
Set Store Credit Update Email Sender to the store identity that appears as the sender of email notifications sent to customers.
Set Store Credit Update Email Template to the template that is used for email notifications sent to customers.