My hair salon sells gift certificates. What is the journal entry for posting the sale of a gift certificate?

And what would the journal entry be when my customer redeems the gift certificate 6 months from now?My hair salon sells gift certificates. What is the journal entry for posting the sale of a gift certificate?
At time of sale: debit Cash, credit Unearned Revenue (a liability account)





When redeemed: debit Unearned Revenue, credit Sales