Another payment issue PLEASE help.

This is an e-mail I received from a user, do I have to set something differently to allow this or for Canadian users if not in USA?

Comments: hello,i just signed up with your website,and i choosed $3.00 a month method of payment,i couldnt go through with it,cause it asked me to link a credit card to my account..i have no other credit card,and my paypal is linked to my bank account. I thought paypal allows this for users?