Credit Note

Hello,

I recently received an email from Apple for a credit note, from a subscription I accidently purchased.

However, I have no idea where or how to use this credit note, and I can't see it visible on my Apple account?

I paid for this on my debit card, so I would of assumed it would go back to my card?

Can someone shed some light on this please? Of where to find it and process it?

Thank you.

Charlotte