Are you a prepaid or postpaid customer? subscription fee was separated from your normal cellular bill

Postpaid

I'm in postpaid paying monthly. 

so it is as Dinh says, stand alone subscriptions are billed separately from your monthly phone bill. The only exclusion to this is if you get Amazon Prime through Koodo as a subscription NOT through Stream+. If that is the case then it will be added to your usual monthly bill but all others are billed separately every 30 days after you activate the subscription to the card you use to sign up for the subscription.