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...
If you are a consumer (private person), you have the legal right to withdraw from the contract within 14 days, under OUG 34/2014. For domains, this right ends once the domain is registered, which you expressly agree to at checkout.
All the details are on the right of withdrawal page.