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Model

CreditmemoNotifier

Magento\Sales\Model\Order\CreditmemoNotifier

What it does

The CreditmemoNotifier class is responsible for sending credit memo email notifications to customers when a refund is processed.

Developers would use this class when they need to programmatically trigger credit memo notification emails after creating or updating a credit memo in Magento 2.

It extends AbstractNotifier and uses the CreditmemoSender to handle the actual email delivery.