After you have successfully signed up, activated your account, and verified your credit card on our platform, you will be able to access the management portal via http://my.gdaas.com using your e-mail address and password to log in.
Once logged in, go to Settings > Billing:
Click on ‘Pay €xxx’. The credits will appear on your account now and be charged from your Credit Card.
Please note that adding credits to a customer account, can only be done to the administrator(s) of that account. Not by the user(s). Read here how to switch your users to administrators and vice-versa.