Each time a credit card payment is made, an email is sent to the address on file.  Within the email there are two links;

1) the first link is to the invoice itself, and

2) the second link is to your account page.  

On your account page you will see a link to Edit Subscription. Use that link to change your credit card details. 

If you cannot find an invoice that was emailed to you, please check your SPAM, or other folders and labels that may filter out automated messages.    Be sure to whitelist mailer@fastspring.com so that it messages go directly to your inbox.

If you are paying by bank-transfer or cheque, please email sales@analyticscanvas.com with your license key and account information.