What is the difference difference between 'Issue Card' & 'Additional Card'

Issue Card

This will write a card and invalidate any card before this.

example: When issuing a second card of the same type, this will invalidate previous cards of the same type

The previous customs cards will still operate the lock until a new custom card is presented to the lock.

Note: The previous custom cards are still shown in the Database as valid until the expiry date set for the cards are reached.

Additional Card

This will write a card and still keep previous ard types valid.

Note: As soon as 'issue card is selected - all previous cards will be invalidated.