Prerequisites for Credit Card Types.
Credit Card Types are two-character values that represent a specific type of card, such as a Master Card or Visa. Credit Card Types are available for selection when you create a payment method for a credit card or other type of card.
Multiple Credit Card Types exist by default and are automatically available during property creation. You cannot delete these default Credit Card Types and can only edit the sequence value.
However, you can create additional Credit Card Types. You can also delete the Credit Card Types you create as well as edit the description and sequence values.