Online by card (Visa or Mastercard), through NETOPIA Payments. You pay straight from the invoice page in your client account, and the payment is confirmed insta...
Billing details and domain holder details serve different purposes. Do not assume that updating one automatically updates the other. If you want to change the person or company holding the domain, check the separate procedure that applies to that domain extension.
For a .ro domain, the required details include the holder type, name, personal or company identification number and, for companies, the Trade Register number. Before requesting a change, clarify whether you only want to update your billing details or also change the domain holder. Avoid sending additional documents or personal information until you know what is required and which channel to use.