When you make your very first purchase at Link-Assistant.Com, you get automatically registered by our payment processor 2Checkout (former Avangate).
You can add a new credit/debit card, as well as update your billing information in your Shopper Account.
Once the data has been saved, the new credit/debit card will show up in your account. You can then assign the card to your active subscriptions for future charges.
CC details can only be managed for active, ongoing subscriptions (including the ones past their renewal deadline, but not expired). In case you're placing a new order, simply use any required billing details on the Checkout, no matter which ones were used previously.
If you have any trouble finding any details in your 2CO Shopper Account, don't hesitate to contact our Support Team anytime!