Some states in the United States may prompt you to enter a 6-digit postal code (ZIPCODE) when completing a transaction with a credit card. Currently, CITIC does not verify the postal code in credit card transaction information, so you can enter any 6 digits numerical value. This method of refueling will generally freeze a specified amount (for example, USD200) according to the merchant's settings, and the final refueling fee will be charged based on the actual fees incurred.