They should give you some sort of certificate at check in. Then, when you go to the gift shop, take your certificate with you and have the cashier staple your receipts to it. It's really easy this way to keep track of what you've 'spent'.
44 days til CSS!!!!
We just got back from CTI and they no longer give you a voucher for resort credits. You are advised at check-in how many 'points' (dollars) credit you have and when you start to 'spend' them you are given a receipt which you sign and which shows the balance of credit left on your account - if you spend more than your credit you settle up when you check out.