If you would like to update your billing information for your API Nation subscription, you can do so by logging into your API Nation account and going to the subscription section of the website.
1.) Head to the following link and enter your credentials to sign in: https://my.apination.com/user/login/
2.) From here you will land on your 'syncs' page, you can hover over the 'Account' text in the upper right hand corner of this page and selection 'Subscription'.
3.) And click on 'Add Card' to add a new payment method. You can also click on the 'trash can' icon to remove a current card on your API Nation account.