I know most of you here purchase and import stuff online so I guess I'll ask here

, I recently purchase a game and the shipping package was from FedEx, it came and I sign already. Today in mailbox I receive a mail saying I owe them 15.73, I never got this problem before because the guy like UPS, CanadaPost, and etc usually ask to pay the same time I sign the package. Anyways is there a way I can pay online because I don't want to mail my money. It a hassle to withdraw money then buy stamp and envelope and mail just to mail 15.73, also if possible someone can tell me the step to pay online.