How do I know whether a customer has got her refund?

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Hi. I have refunded an order to a customer 3 days ago, but my customer told me today that she hasn't got her refund yet. I know the refund process might take up to 10 business days according to the Shopify guideline. Just wanted to know how can I be sure whether a customer has got a refund? Will there be any notification or status check on Shopify?