For Alberta Provincial Parks (from the website):
Late Arrivals/No Shows
You must notify the Contact Centre at 1-877-537-2757 of a late arrival. A late arrival is a planned arrival after 2 PM of the day following your scheduled arrival date (i.e. arriving after 2 PM on Saturday, July 9 for an original arrival date of Friday, July 8).
If notice is not provided, the reservation is considered a 'no-show' and will be cancelled. The campsite will be released for resale.
Up to four nights camping fees will be forfeited, depending on the length of your stay. Any remaining camping fees will be refunded to the credit card used for the original transaction. The reservation fee is non-refundable.