To pay your bill automatically every month, you can set-up pre-authorized payments on your account using a credit card or by associating a bank account with your Koodo account. When associating a bank account, Koodo will automatically take the money from the account you associate to it. Same thing with credit card except, it'll just charge the credit card.
I believe you can pay with a debit card at a Koodo stall but I may be wrong about that. There is however, no option to use paypal.