Please wait at least 15 minutes after an attempt looks like it failed before trying again. Check your balance before trying again as often charges that seemed to have failed are posted a few minutes later.
Please note that for credit cards we add a fee of 3.627% to the amount we charge to cover the credit card fees.
If after this the registrars abusing customer harasses us (defined as more than 1 email or phone call) there will be an additional fee of $280. This is to give registrars an incentive to not pass our contact info to their abuse customers, which some have been doing.