Card type enumeration
This enum indicates the type of a bank card.
Bank card types are used in the following structures:
|Enum value||Byte / int value||Description|
|Unknown||0||The card type is unknown.|
|MasterCard||10||Standard MasterCard bank cards.|
|Visa||20||Standard Visa bank cards.|
|AmericanExpress||30||All kinds of American Express cards.|
|Electron||40||VISA Electron bank cards.|
|Maestro||50||16 or 19 digit Maestro cards.|
NOTE: The enum value is returned as string.