A company operates an arcade place where customers put money into game membership cards and they also accumulate points for winning and can be redeemed for prizes. How to account for the credits not yet used and also the points?

Question

I would think....
1) For Game card: Ex) put in $100 dollars, used $20, left with $80 on card

Debit Cash 100
Credit revenue 20
Credit deferred revenue 80

When the remaining 80 is used:
Debit deferred revenue 80
Credit revenue 80

Is this correct?

2) For points earned, let say customer earned 500 points (worth $50 of prizes), but not yet redeemed, how would the journal entry be for the company? And what is journal entry when customer redeems the prize?

Thanks.